How do you determine the slope interscept equation of two given pointa

Choose your points, go up from the y intercept to a chosen x point. Then go over the the x point. Up and over is the formula I use.

104$

Explanation:

She is paid 7$ for each of the first 7 demo

And she is paid 11$ for each demo over the 7 demo

But she did 12 demo, which mean the first 7 demo she got paid 7$ each and for the last 5 demo she got paid 11$ for each demo.

(7 • 7) + (11 • 5)
= 49 + 55
= 104$