Ineedhelp437 Ineedhelp437

20-10-2016
Mathematics

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2x+y=90
10x-4y=90
Please tell me how to do it so I can remember

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apologiabiology apologiabiology

20-10-2016

so eliminate the y's
multiply first equatoin by 4 and add to 2nd eqution
8x+4y=360
10x-4y=90 +
18x+0y=450

18x=450
divide both sides by 18
x=25
sub back

2x+y=90
2(25)+y=90
50+y=90
minus 50
y=40

(x,y)
(25,40) is thea nswer

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