William S. answered • 12/17/13

Tutor

4.4
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Experienced scientist, mathematician and instructor - William

Dear Medina,

We know two points on the line: (13, 9) and (30, 26).

We know that slope intercept form is y = mx + b

The slope, m, is given by (26 - 9)/ 30 - 13) = (17)/(17) = 1

y = x + b

All we have to do now is to figure out the y-intercept, b

b = y - x

b = 9 - 13 = -4

Note that we would get the same result if we had used

b = 26 - 30 = -4

So the equation of the line is

**y = x - 4**