x-4y=31 -x+3y=-25 find the so;ution

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21-07-2017
Advanced Placement (AP)

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x-4y=31 -x+3y=-25 find the so;ution

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mreijepatmat mreijepatmat · Answer 1 · 2017-07-25T17:43:51+02:00

mreijepatmat mreijepatmat

25-07-2017

a) x - 4y = 31
b) -x +3y = - 25
To solve ad up a) & b)

a) x - 4y = 31
b) -x +3y = - 25
---------- ------
0.x - y = 6 then y = -6
Now replace y by - 6 in any of te 2 equations & you'll find x = 7

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