Question

Describe how you can find an equation from a chart. (How do you find the information to plug into the form y=mx+b?)

Answer 1

y = (y2 -y1)/(x2 -x1)x +(y1 -(y2 -y1)/(x2 -x1)x1)

Explanation:

You can use two points (x1, y1) and (x2, y2) from the table to make the following computations:

The slope (m) is ...

m = (y2 -y1)/(x2 -x1)

and the y-intercept (b) can be computed from ...

b = y1 -m(x1)

Then put these into your equation ...

y = mx +b