Montana Math MT.CORE.ALG.LIN.4.b

MathGrades 9–12Linear Functions and Expressions

The Standard

MT.CORE.ALG.LIN.4
Understand that linear equations can be represented in multiple forms and the specific features of each form by: Choosing the form strategically when writing an equation based on given information and intended use, Converting between slope-intercept, point-slope, and standard form symbolically, Understanding the relationship between slope-intercept form, the rate of change, and the initial value, Understanding the relationship between point-slope form, the rate of change, and a given point, and Understanding the relationship between standard form and the x- and y-intercepts.
Understand that linear equations can be represented in multiple forms and the specific features of each form by: Converting between slope-intercept, point-slope, and standard form symbolically,

2026 Montana Mathematics Content Standards · Algebraic and Functional Reasoning

Teacher's field guide

What This Standard Means

What Students Need to Do

Students rewrite linear equations in slope-intercept, point-slope, and standard form. They use algebra to change the form without changing the line.

What Mastery Looks Like

Given y − 4 = 3(x − 2), a student writes y = 3x − 2 and 3x − y = 2. They check that each equation gives y = 4 when x = 2.

Common Misconceptions

Students may read (x − 2) as an x-coordinate of −2. They may also lose a negative sign when distributing or move a term across the equals sign without changing its sign.

How to Assess It

Exit ticket: Convert y − 3 = 2(x − 1) to slope-intercept and standard form. Substitute x = 1 to check both answers.

Lesson moves

Ways to Teach It

  1. Give pairs graph paper and cards showing y = 2x + 1, y − 3 = 2(x − 1), and 2x − y = −1; have them graph each equation.

  2. Ask students to write two algebra steps showing why y − 3 = 2(x − 1) and y = 2x + 1 describe the same line.

  3. Run a conversion relay: students turn y = 3x − 2 into point-slope form, then standard form, and check each equation at x = 2.

  4. Post a taxi fare of $4 plus $2 per mile; students write all three forms, using the fare at 3 miles for point-slope form.

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