1. To find out if (0,3) is a solution to y = x +3 you replace x and y with (0,3)
y = x + 3
3 = 0 + 3
3 = 3 Correct
The answer is YES
2. To find out if (1,-4) is a solution to y = -2x you replace x and y with (1,-4)
y = -2x
-4 = -2(1)
-4 = -2 Incorrect
The answer is NO