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Coordinate Geometry Mastery

A secondary mathematics curriculum sequence exploring linear functions and geometric transformations on the Cartesian coordinate plane, featuring print-ready guided practice and teacher keys.

FMFernando Mancini
Linear Equations Mastery

A targeted secondary mathematics lesson on graphing linear equations in slope-intercept form and determining equations directly from coordinate planes. Contains guided student practice and a complete teacher answer key.

Geometric Translations

A targeted secondary geometry lesson on identifying, describing, and writing coordinate rules for translations on the Cartesian plane. Features vector coordinate diagrams and algebraic mapping notation.

Coordinate Geometry Mastery

A secondary mathematics curriculum sequence exploring linear functions and geometric transformations on the Cartesian coordinate plane, featuring print-ready guided practice and teacher keys.

FMFernando Mancini

\(y\)-int (\(b\)): \(-1\)

Slope (\(m\)): \(-\frac{1}{3}\)

Equation:

\(y = -\frac{1}{3}x - 1\)

2 Solution

x y

\(y\)-int (\(b\)): \(-2\)

Slope (\(m\)): \(\frac{1}{4}\)

Equation:

\(y = \frac{1}{4}x - 2\)

3 Solution

x y

\(y\)-int (\(b\)): \(-4\)

Slope (\(m\)): \(2\)

Equation:

\(y = 2x - 4\)

4 Solution

x y

\(y\)-int (\(b\)): \(3\)

Slope (\(m\)): \(\frac{1}{4}\)

Equation:

\(y = \frac{1}{4}x + 3\)

5 Solution

x y

\(y\)-int (\(b\)): \(3\)

Slope (\(m\)): \(-4\)

Equation:

\(y = -4x + 3\)

6 Solution

x y

\(y\)-int (\(b\)): \(4\)

Slope (\(m\)): \(-3\)

Equation:

\(y = -3x + 4\)

7 Solution

x y

\(y\)-int (\(b\)): \(-2\)

Slope (\(m\)): \(\frac{1}{5}\)

Equation:

\(y = \frac{1}{5}x - 2\)

8 Solution

x y

\(y\)-int (\(b\)): \(-4\)

Slope (\(m\)): \(-7\)

Equation:

\(y = -7x - 4\)

Page 2 of 2 Answer Key • Writing Linear Equations Teacher Resource • Linear Equations Practice

Part 2: Identify the Translation Rule from Pre-Image to Image

Name:

Date:

Period:

Score:

FOCUS Notice horizontal or vertical only shifts (where \(h=0\) or \(k=0\))

Pre-Image: Black line, letters without primes Image: Blue line, letters with primes \(' \)

6 \(\triangle GHI \to \triangle G'H'I'\)

Select one rule

x y H G I H' G' I'

A 5 units right B 6 units up C 2 units right, 1 up D 3 units right, 1 up

Rule: \((x, y) \to (\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

7 \(\triangle EFG \to \triangle E'F'G'\)

Select one rule

x y F E G F' E' G'

A 4 units left, 2 up B 4 units left C 4 units left, 3 up D 3 units left, 1 up

Rule: \((x, y) \to (\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

8 \(\triangle QRS \to \triangle Q'R'S'\)

Select one rule

x y Q R S Q' R' S'

A 4 units right, 1 down B 4 units right, 7 down C 4 units right, 5 down D 5 units right, 6 down

Rule: \((x, y) \to (\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

9 \(\triangle RST \to \triangle R'S'T'\)

Select one rule

x y R S T R' S' T'

A 3 units right, 1 down B 2 units right C 4 units right, 1 down D 1 unit left

Rule: \((x, y) \to (\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

10 \(\triangle QRS \to \triangle Q'R'S'\)

Select one rule

x y Q R S Q' R' S'

A 2 units left, 7 up B 3 units left, 7 up C 1 unit left, 1 down D 4 units left, 2 up

Rule: \((x, y) \to (\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

Coordinate Rule Extension & Application Apply the rule algebraically

Extension A: Point \(A(5, -2)\) is translated under the rule from Problem 1.

New coordinates: \(A'(\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

Extension B: Point \(B(-3, 6)\) is translated under the rule from Problem 8.

New coordinates: \(B'(\text{\underline{\hspace{1.2cm}}}, \text{\underline{\hspace{1.2cm}}})\)

Page 2 of 2 • Geometric Transformation Rules Check: Apply the rule to every vertex to verify your answer!

Page 1 of 2 Answer Key • Geometric Translation Rules Teacher Resource • Coordinate Transformations

Geometric Translations

TEACHER ANSWER KEY

Part 2: Solutions & Extension Applications (Problems 6–10)

Total Points 10 Problems (20 Pts)

Standard CCSS 8.G.A.1 / HSG-CO.A.2

Scoring: 1 pt for multiple choice; 1 pt for coordinate rule; 2 pts for Extension questions Green highlights indicate correct answers

6 \(\triangle GHI \to \triangle G'H'I'\)

Answer: A

x y H G I H' G' I'

A 5 units right

B 6 units up

C 2 units right, 1 up

D 3 units right, 1 up

Rule: \((x, y) \to (x + 5, y)\)

7 \(\triangle EFG \to \triangle E'F'G'\)

Answer: A

x y F E G F' E' G'

A 4 units left, 2 up

B 4 units left

C 4 units left, 3 up

D 3 units left, 1 up

Rule: \((x, y) \to (x - 4, y + 2)\)

8 \(\triangle QRS \to \triangle Q'R'S'\)

Answer: C

x y Q R S Q' R' S'

A 4 units right, 1 down

B 4 units right, 7 down

C 4 units right, 5 down

D 5 units right, 6 down

Rule: \((x, y) \to (x + 4, y - 5)\)

9 \(\triangle RST \to \triangle R'S'T'\)

Answer: B

x y R S T R' S' T'

A 3 units right, 1 down

B 2 units right

C 4 units right, 1 down

D 1 unit left

Rule: \((x, y) \to (x + 2, y)\)

10 \(\triangle QRS \to \triangle Q'R'S'\)

Answer: D

x y Q R S Q' R' S'

A 2 units left, 7 up

B 3 units left, 7 up

C 1 unit left, 1 down

D 4 units left, 2 up

Rule: \((x, y) \to (x - 4, y + 2)\)

Coordinate Rule Extension Solutions & Work 2 Points Each

Extension A: Point \(A(5, -2)\) under rule \((x - 3, y - 2)\):

\(x' = 5 - 3 = 2\),   \(y' = -2 - 2 = -4\)

Answer: \(A'(2, -4)\)

Extension B: Point \(B(-3, 6)\) under rule \((x + 4, y - 5)\):

\(x' = -3 + 4 = 1\),   \(y' = 6 - 5 = 1\)

Answer: \(B'(1, 1)\)

Page 2 of 2 Answer Key • Geometric Translation Rules Teacher Resource • Coordinate Transformations

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