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PolarNik [594]
3 years ago
15

−4x + y = 6 −5x − y = 21

Mathematics
1 answer:
Vesna [10]3 years ago
3 0
Assuming x=x and  y=y in both equations
add them together

-4x+y=6
<u>-5x-y=21  +</u>
-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)
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