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X plus y equal to -1 and 4x minus 3y equal to 12 what is the answer?
Nilfa143
x + y = -1 (a) 4x - 3y = 12 (b)
3(a)+(b) gives 3x + 3y + 4x - 3y = -3 + 12 or 7x = 9 or x = 9/7
then x + y = -1 gives y = -1 -x = -1 - 9/7 = -16/7
So, x = 9/7 and y = -16/7
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