Hi, 

solve using cramer's rule

2a+3b=6

2a+b=-2

 = 2 -6 = -4

 = 6-(-6) = 12

  = -4 -12 = -16

a = 12/-4 = -3

b = -16/-4 = 4

checking our answer

2a + b = -2

-6 + 4 = -2  

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