please solve this sys of eqations
-4x+2y+410=0
-6y+2x+640=0
I keep getting y=-71 as the first part but not sure and wanted to check
Thanks
2006-12-14 11:54:07 · 6 answers · asked by relms2000 1 in Science & Mathematics ➔ Mathematics
OK!!!
-4x+2y+410=0
-6y+2x+640=0
Multiply that first equation by 3 on both sides:
-12x + 6y + 1230 = 0
Add it to the second equation to get:
-10x + 1870 = 0
So: x = 187
Then substitute into either of the first two equations and solve for y. You should get 169.
Done.
2006-12-14 11:58:00 · answer #1 · answered by Jerry P 6 · 0⤊ 0⤋
1st equation: -4x + 2y + 410 = 0
2nd equation: 2x -6y + 640 = 0
Multiply 2nd eq. by 2 to get:
4x - 12y +1280 = 0
-4x +2y + 410 = 0
Now add the 2 equations to get:
-10y + 1690 = 0
-10y = -1690
y = 169
Now plug the value of y into one of the 2 equations:
-4x + 2(169) + 410 = 0
-4x + 338 + 410 = 0
-4x + 748 = 0
-4x = -748
x = 187
2006-12-14 12:08:21 · answer #2 · answered by euclidjr 2 · 0⤊ 0⤋
-4x+2y+410=0
-6y+2x+640=0 multiply by 2
4x-12y+1280=0
-4x+2y+410=0 add
-10y+1690=0 add 10y to each side
10y=1690 divide by 10
y=169
-4x+2y+410=0
-4x+2*169+410=0
-4x+338+410=0 add 4x
4x=748 divide by 4
x=187
(187, 169)
check -6*169+2*187+640=0
-1014+374+640=0
0=0
2006-12-14 12:07:26 · answer #3 · answered by yupchagee 7 · 0⤊ 0⤋
i get x=187 and y=169
(well my calculator can do them)
ok, 3 min later here is my writen work:
find x useing the -4x eqn.
x=(2y +410)/4
sub into -6y eqn.
5y=845
y=169
now using that:
4x=2*169+410
x=187
2006-12-14 11:58:37 · answer #4 · answered by Anonymous · 0⤊ 0⤋
unfortunately I got y=169...
try subsituting the value into the equation.
also i got x=205+y
substitute that in as well
2006-12-14 12:00:39 · answer #5 · answered by Anonymous · 0⤊ 0⤋
x= -75 or y= -75
2006-12-14 12:32:08 · answer #6 · answered by Albania 1 · 0⤊ 0⤋