SECTION 4-2 Using Intercepts.

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Presentation transcript:

SECTION 4-2 Using Intercepts

The x-intercept is where the line crosses the x-axis. The y- intercept is where the line crosses the y-axis.

X-intercept: 2 Y-intercept:-4

Formula: Ax+By=C

Example: What is the y-intercept of 2x+y=4 2(0)+y=4 y=4 The y-intercept is the y-coordinate of the point where the y-axis . Therefore y is equal to 4 because x=0.

Practice: Find the x and y intercepts 1. 4y-8=2x 2. 4x+y=8 3.

4. y-x=-1 5. 2x+3y=18 6. x-3y=-1

Answers: 1. x-int. -4 Y-int. 2 2. x-int. 2 Y-int. 8 HOMEWORK PG.240 (1-12) odds