Find the value of (x + y)
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Applying the rule below:
The top at the left side of the equation equals the top at the right
-3x + 3 = 6
-3x = 6 - 3
-3x = 3
Divide both sides by -3
-3x/-3 = 3/- 3
x = - 1
The down at the left side of the equation equals the down at the right
-2y = 8
Divide both sides by -2
-2y/-2 = 8/-2
y = -4
x + y = -1 + -4 = -5