Solve for x.
2007-10-22 09:49:31 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
2x - 3y = 17
3x + 3y = - 12----ADD
5x = 5
x = 1
1 + y = - 4
y = - 5
x = 1 , y = - 5
2007-10-22 10:46:16 · answer #1 · answered by Como 7 · 0⤊ 0⤋
2x-3y=17
x+y= -4
Multiply the 2nd equation with 2
2x+2y=-8
now deduct this from the 1st equation
2x-3y=17
2x+2y=-8
---------------
0x-5y=25
-5y=25
y=-5
now substitute this y=-5 in the second equation
x+y=-4
x-5=-4
x=-4+5
x=1
2007-10-22 16:55:41 · answer #2 · answered by Siva 5 · 1⤊ 0⤋
multiply x+y=-4 by 3
3x + 3y = -12
2x - 3y = 17
5x -0 = 5
5x = 5
x=1
2007-10-22 17:02:32 · answer #3 · answered by Doug M 1 · 0⤊ 0⤋
x+y = -4
y = -x - 4
2x-3y = 17
set y = -x - 4
2x-3(-x - 4) = 17
2x+3x+12 = 17
5x = 5
x = 1
2007-10-22 17:02:40 · answer #4 · answered by Drew B 1 · 0⤊ 0⤋
2x-3y=17
2x=3y+17
x=3y/2+17/2
x+y=-4
x=-y-4
2007-10-22 16:52:32 · answer #5 · answered by brndhwll6 2 · 1⤊ 0⤋