Question 66535
3. x-y =3
If x =-6 what is the value of Y

1) y = 3x - 1 (x = -2)
All you do with this one is substitute -2 in for x.
y = 3(-2) - 1
y = -6 - 1
y = -7

2) (2, 7) and (-3, -8)

3) -6 - y = 3
   +6     +6
_________________
(-y = 9) -1

y = -9

(** Your variable (the letter) can NEVER be negative, so you must multiply/divide by -1 if the variable is a negative.