12 March, 19:48
What is x+3y+1 - 3x-3y=-15 by using substitution
12 March, 20:16
Answer: x = 7 y = - 2
Assuming you meant x + 3y = 1 and - 3x - 3y = - 15.
Take the first eq and solve it to x = 1 - 3y. Then take that into the 2nd eq.
-3 (1 - 3y) - 3y = - 15
-3 + 9y - 3y = - 15
-3 + 6y = - 15
6y = - 12
y = - 2
Take that into first eq
X + 3 (-2) = 1
X + - 6 = 1
X = 7
(7, - 2) is the answer
12 March, 20:49
x = 8
x + 3y + 1 - 3x - 3y = - 15 (+3y will eliminate - 3y)
-2x + 1 = - 15
-2x = - 16
x = 8
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