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22-02-2017
Mathematics

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how do you do elimination on 5x+y=9 and 10x-7y=-18

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michelleirias michelleirias

22-02-2017

(5x+y=9)-10
(10x-7y=-18)5

-50x-10y=-90
50x-35y=-90

-45y=-180
-180/-45=4
y=4

5x+(4)=9
5x+4=9
-4 -4
5x=5
x=1
(1,4)

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