## anonymous one year ago What is the equation of a horizontal line passing through the point (−7, 5)?

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1. Nnesha

|dw:1443657286442:dw|red line is horizontal it's not moving up or down slope = rise over run horizontal line when y value is constant and x values r changing

2. Nnesha

do you know the formula to find slope ?

3. anonymous

no

4. Nnesha

$\huge\rm \frac{ y_2-y_1 }{ x_2 -x_1 }$ change in y's over change in x's

5. Nnesha

you need two x's and y's value to find slope so when line is horizontal y values would be the same for y_2 y_1 so when we subtract same number what would we get ?

6. Nnesha

here is an example |dw:1443657629609:dw| when x=1 y=3 , x=2 y=3

7. Nnesha

so when we substitute x's nd y's for their values $\frac{ 3-3 }{ 2-1}=slope$