MONA S. answered • 06/03/20

Experienced ACT Math tutor with over 9 years experience

Hi Mya,

to determine what the y intercept is when the line crosses the y axis and x = 0, we first have to determine the equation of the line. We are given two points, we can determine the slope and then put one of the ordered pairs into the y = m x + b.

slope is the difference of the two y's divided by the difference of the two x values. 2 --8 for the y is 10 and 1-3 is -2. So 10 / -2 = -5.

Then take one of the ordered pairs and substitute it into y = m x +b and solve for b the y intercept.

b = 7

I hope this helps