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22-01-2019
Mathematics

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What is 2x+y=8 and x-2y=-1

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kayeecheng2102p3s8sa kayeecheng2102p3s8sa

22-01-2019

the solutions of x and y?

2x+y=8...(1)
x-2y=-1...(2)
for (2), x=-1+2y...(3)
sub(3) into(1),
2(-1+2y) +y=8
-2+4y+y=8
5y=10
y=2
sub y=2 into(3)

x=-1+2(2) =3
therefore, x=3,y=2

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