SOLUTION: How do I solve using cramer's rule? 2a+3b=6 2a+b=-2

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Question 365000: How do I solve using cramer's rule?
2a+3b=6
2a+b=-2
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!


Hi, 

solve using cramer's rule

2a+3b=6

2a+b=-2

D+=%28matrix%282%2C2%2C2%2C3%2C2%2C1%29%29 = 2 -6 = -4

D%5Ba%5D+=%28matrix%282%2C2%2C6%2C3%2C-2%2C1%29%29 = 6-(-6) = 12

D%5Bb%5D+=%28matrix%282%2C2%2C2%2C6%2C2%2C-2%29%29  = -4 -12 = -16

a = 12/-4 = -3

b = -16/-4 = 4

checking our answer

2a + b = -2

-6 + 4 = -2