solve by substituation.....?

0 ⤊

solve by substituation.....?

y=4x-9
3x+2y=neg. 7

2006-06-10 03:32:46 · 3 answers · asked by lovinmymatt 2 in Science & Mathematics ➔ Mathematics

3 answers

3x +2(4x - 9) = -7
3x + 8x - 18 = -7
11x = 11
x = 1

y = 4(1) - 9
y = -5

2006-06-10 03:37:45 · answer #1 · answered by Anonymous · 0⤊ 0⤋

y = 4x - 9
3x + 2y = -7

3x + 2(4x - 9) = -7
3x + 8x - 18 = -7
11x - 18 = -7
11x = 11
x = 1

y = 4x - 9
y = 4(1) - 9
y = 4 - 9
y = -5

x = 1 and y = -5

2006-06-10 13:26:25 · answer #2 · answered by Sherman81 6 · 0⤊ 0⤋

3x+2(4x-9)=-7
3x+8x-18=-7
11x=-7+18
11x=11
x=1
y=4(1)-9
y=-5

2006-06-10 10:57:28 · answer #3 · answered by gari 3 · 0⤊ 0⤋