davidfoster14 davidfoster14

06-02-2015
Mathematics

Answered

My teacher gave me a sheet of this and no instructions:

1. 5x+2y=10
-5x+7y=8

I don't know what I am suppose to do.

Answer :

apologiabiology apologiabiology

06-02-2015

probably wants you to find what numbers will work for x and y in both equations

add the two equations together
5x-5x+2y+7y=10+8
9y=18
divide both sdies by 9
y=2
subsitute into first equation
5x+2(2)=10
5x+4=10
subtract 4 from both sides
5x=6
divide both sdies by 5
x=6/5

so the asnwer is x=6/5 and y=2

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