anonymous
  • anonymous
how do you get the answer to (x-y=-5 (-x+4y=10
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
all i know is you use substitution
anonymous
  • anonymous
add the two equations and post what you got.
anonymous
  • anonymous
what do you mean by add them

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anonymous
  • anonymous
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
anonymous
  • anonymous
x-y = 5 -------> Equation 1 -x+4y = 10 ------------> Equation 2 Add equations 1 and 2
anonymous
  • anonymous
oh also if it helps im only in 8th grade
shadowfiend
  • shadowfiend
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.
anonymous
  • anonymous
No shadow fiend. The problem is different. These answers were getting jumbled up, with another post
anonymous
  • anonymous
so -x=4y=5
anonymous
  • anonymous
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,
anonymous
  • anonymous
meaning (x-y) +(-x+4y) = -5 + 10
anonymous
  • anonymous
wow this is even more confusing now
anonymous
  • anonymous
what is confusing about this?
shadowfiend
  • shadowfiend
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.
anonymous
  • anonymous
ok thx for the answers not confusing any more
anonymous
  • anonymous
do you understand that if a = b and c = d, then a+c will be equal to b+d?
anonymous
  • anonymous
yeah
shadowfiend
  • shadowfiend
Rock it. Make sure you click `good answer' next to the answers that were helpful :)
anonymous
  • anonymous
alright can do
anonymous
  • anonymous
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.
anonymous
  • anonymous
yeah
anonymous
  • anonymous
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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