Question

If (-1,b) is a point on the graph of y=-5x+4 what is b?

Answer 1

9, you would have to take y=-5x+4 and use -1 from the original coordinate as x then solve.

Answer 2

(x, y)
x = -1
y = b

b = -5(-1) + 4
b = 5 + 4
b = 9