6Solve the system by substitution. Write your answer as an ordered pair.?

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3x + 3y = 18; -5x + 18 = y

2007-12-02 05:52:42 · 2 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics

3x+3(-5x+18) = 18
3x -15x +54 = 18
-12x = -36
x = 3
y = -5(3) +18 = 3
(3,3) <-- answer

2007-12-02 05:58:44 · answer #1 · answered by ironduke8159 7 · 0⤊ 0⤋

3x + 3y = 18; -5x + 18 = y

3x + 3(-5x+18) = 18
3x-15x+54=18
-12x=-36
x=3

So 3(3)+3y=18
9+3y=18
3y=9
y=3

2007-12-02 14:01:30 · answer #2 · answered by DANIEL G 6 · 0⤊ 0⤋