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3x - 3y = 12 ,,,, divide all equation on 3 ---> x - y = 4 .. Eq.1

4y - 8x = -16 ,,,, divide all equation on 4 ---> -2x + y = -4 .. Eq.2

by calculating the two eq. together the result will be :

x - 2x = zero

-x = zero

X = zero

Put the value of X, on Eq.1 to find the value of Y :

x - y = 4

zero - y = 4

Y = 4

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Q: 3x - 3y equals 12 4y - 8x equals -16?
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