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If 8x−4y=20 and 4x−8y=4, what is the value of x−y
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If 8x−4y=20 and 4x−8y=4, what is the value of x−y

User Alex Zak
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1 Answer

6 votes

Answer:

x-y=3-1=2

Explanation:


8x-4y=20
4x-8y=4


8x=20+4y
4((20+4y)/(8))-8y=4


x=(20+4y)/(8)
(80+16y)/(8) -8y=4


x=(20+4)/(8)
10+2y-8y=4


x=(24)/(8)
10-6y=4


x=3
-6y=4-10


-6y=-6


y=1

so x-y=3-1=2

User AKun
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