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2x - y = 6
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4x = 16
x =4 ; y =2
8a -7b = -4 *(3)
6a -3b = 6 *(-7)
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24a -21b = -12
-42a +21b =-42
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-18a = -54
a =3 ; b = 4
m = 2 + n *(-1)
m =-4 + 3n
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-m = -2 -n
m = -4 +3n
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0 = -6 +2n
2n = 6
n = 3 ; m = 5