Posted by mike on Wednesday, March 18, 2009 at 7:09pm.
I would multiply the top equation by 5, and the bottom equation by 2
20x-10y=160
-6x-10y=-22
then subtract the bottom equation (remember to change the signs)
26x=182 solve for x.
alright i got x=7 but now what do i do?
Go back to either of the original equations, put in 7 for x, and solve for y.
so for example
4(7)-2y=32 or -3(7)-5y=-11
and then it equals 28-2y=32 or
-21-5y=-11
then what from their this is driving me insane!
add 21 to each side.
divide each side by -5
I think the answer is y=2,but you better check.
Yep, 2 is almost right, but not quite. Check to see why.
i honestly cannot not get this problem, i guess it wont kill me to miss 1 assignment
-2x+3y=-12
2x+y=10