how do you get the answer to (x-y=-5 (-x+4y=10

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how do you get the answer to (x-y=-5 (-x+4y=10

Mathematics
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all i know is you use substitution
add the two equations and post what you got.
what do you mean by add them

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steps: x-y=-5 -x+4y=10 despejas x x=-5+y 5-y+4y=10 3y=5 y=5/3 ahora en x-y=-5 x-(5/3)=-5 x=-10/3
x-y = 5 -------> Equation 1 -x+4y = 10 ------------> Equation 2 Add equations 1 and 2
oh also if it helps im only in 8th grade
By `add' he means basically add each part (the parts with x, the parts with y, and the parts with neither) in each equation, and see what the resulting equation is.
No shadow fiend. The problem is different. These answers were getting jumbled up, with another post
so -x=4y=5
if (3 x 4 ) = 12 and (5 x 4) = 20, then when we add the equations we get (3 x 4) + (5 x 4) = 12 + 20 12 + 20 = 32 32 = 32. so it checks out. similarly add your equations,
meaning (x-y) +(-x+4y) = -5 + 10
wow this is even more confusing now
what is confusing about this?
So, norbeybarajas gave another good answer, both will lead you to the same path. If you add the two equations up, you'll see that the x disappears and you can solve for y.
ok thx for the answers not confusing any more
do you understand that if a = b and c = d, then a+c will be equal to b+d?
yeah
Rock it. Make sure you click `good answer' next to the answers that were helpful :)
alright can do
okay, so that is exactly what I did in your equation. I saw that one equation had x and the other equation had -x. so I knew that if i added them up, the x will cancel each other out, leaving me only with y. which means i can solve for y.
yeah
once I solve for y, all i need to do is substitute it in one of the equations and get x.

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