Answer:
u=-5
Step-by-step explanation:
Slope is y(2)-y(1)/x(2)-x(1). So, your equation is u-10/-2-1. -2-1=-3, so the top number has to be negative to get a positive and has to be 5 times more than three. So, the numerator for the slope would be -15, because -15/-3=5. So, u is equal to -15-10. Therefore u equals -5.
(hope this helps :P)
