Is (1, -1) a solution of y = -3x - 2?

To check if (1, -1) is a solution of y = -3x - 2, you need to substitute x = 1 into the equation to see if y = -1.

y = -3(1) - 2 = -3 - 2 = -5

if x = 1 then y = -5

(1, -1) is NOT a solution of the equation y = -3x - 2

yes. we do proportions in probabilities.