Question

determine 3 solutions to this equation: y = -4x - 5

Answer 1

choose any three real numbers as x values and use them to evaluate and find y.

Answer 2

say, you take x = 1, then equation becomes
y = -4(1) - 5
y = -9
so solution is (1,-9)

take two more values of x and you will get three solutions....☺