−3x−9y=18 4x+3y=12
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Answer:
Step-by-step explanation:
4x+3y=12
4x=12-3y
x=12-3y
4
now by puting the value of x in -3x-9y=18
⇒-3x-9y=18
⇒-3(12-3y)-9y=18
4
⇒-36-9y-9y=18
4
⇒-39-9y-36y=18
4
⇒-39-45y=18
4
⇒-39-45y=18×4
⇒-39-45y=72
⇒-45y=72+39
⇒-45y=111
⇒-y=111
45
⇒y=-111
45
now,
we know that
x=12-3y
4
⇒x=12-3(-111/45)
4
⇒x=12-(-111/15)
4
⇒x=12+111
4×15
⇒x=123
60
⇒x=41
20
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