−4x + y = 6 −5x − y = 21

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asked Aug 15, 2016 228k views

1 Answer

Eduardo Moniz · Answer 1 · 2016-08-22T01:11:07+0000

assuming x=x and y=y in both equations
add them together

-4x+y=6
-5x-y=21 +
-9x+0y=27
-9x=27
divide by 9
-x=3
multiply -1
x=-3

subsiutte
-4x+y=6
-4(-3)+y=6
12+y=6
subtract 12
y=-6

x=-3
y=-6
the soultion set is in (x,y) form
(-3,-6)

−4x + y = 6 −5x − y = 21

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