1. 3x - 3y = 9
to find the x or y intercept, multiply the other variable that you are not tryng to find by 0
3x - 3(0) = 9 3(0) - 3y = 9
3x = 9 -3y = 9
3x/3 = 9/3 -3y/-3 = 9/-3
x = 3 y = -3
2. I did the same thing for the rest
x = 6 y = -2
3. x = 2.5 y = -5
4. x = -4 y = -2/3