Answers

2014-11-05T21:06:06+08:00
X+y=10
x+4y

let x in (x+y=10) be 0
x+y=10
0+y=10
y=10

let y in (x+4y) be 10
x+4y
x+4(10)
x+40
x=-40

So in using substitution method and by substituting it by 0 you will get an answer of y=10 and x=-40
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2014-11-05T21:15:14+08:00
X + y = 10    ----equation 1
x = 4y   -----equation 2
substitute equation 2 to equation 1
x + y = 10
4y + y = 10
5y = 10
 y = 2
substitute y=2 to equation 2
x = 4y
x =4(2)
x = 8
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