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**Volunteers to the board!! **

Warm ups Volunteers to the board!! Graph using intercepts: 2x + 3y = 12 4x – 5y = 20 2x – y = -4 3x + 4y = -8

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**Convert Standard to Slope-Intercept**

Objective: To convert a linear equation from standard form to slope-intercept form.

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**What is the slope of #1? _____ **

Part of being able to analyze a graph is being able to say the slope. Also, sometimes it is easier to graph with the slope and y-intercept than with the x-and y-intercept. Writing an equation from a graph is easier to do with slope and y intercept (y = mx + b) You will have to do this on your test! -2/3

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**Convert Standard Slope-Intercept y = mx + b Ax + By = C Steps:**

1. Subtract Ax 2. Divide everything by B y = mx + b Ax + By = C

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Example 1 Convert the equation from standard form to slope-intercept form: 2x + 3y = 12 -2x -2x 3y = -2x + 12 y = -2x + 4 3 Steps: Subtract Ax Divide everything by B Ax By = C

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Example 2 Convert the equation from standard form to slope-intercept form: 2x – y = -4 -2x x -y = -2x – 4 y = 2x + 4 Steps: Subtract Ax Divide everything by B Ax By = C

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**TOO Convert to slope-intercept form: 4x – 5y = 10**

Now, identify the slope and y-intercept: (hint: slope is m, y-intercept is b) Slope:______ y-intercept:_______ y = 4/5x – 2 4/5 -2

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In General Ax + By = C y = -a x + c b b m = -a/b y-intercept = c/b

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**TOO Identify slope and y-intercept: 5x + 2y = 12 -5x -5x y = -5/2x + 6**

y = -5/2x + 6 Slope:______ y-intercept:_______ y = -5/2x + 6 -5/2 6

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**Homework Equations in Two Variables (pt. 1)**

Show your work at the bottom of the paper Convert to y=mx + b State m and b

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When an equation is in slope-intercept form: Examples: Identify the slope of the line and the y- intercept for each equation. 1. y = 3x +2 2. y = ½.

When an equation is in slope-intercept form: Examples: Identify the slope of the line and the y- intercept for each equation. 1. y = 3x +2 2. y = ½.

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