SOLUTION: solve each system by substitution {3a+b=3 {2a-5b=-15

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Question 675494: solve each system by substitution
{3a+b=3
{2a-5b=-15
Answer by ReadingBoosters(3246) About Me  (Show Source):
You can put this solution on YOUR website!
3a+b=3
2a-5b=-15
...
b = 3-3a
2a - 5(3-3a) = -15
2a - 15 + 15a = -15
17a = -15 + 15
17a = 0
highlight_green%28a+=+0%29
...
3(0) + b = 3
highlight_green%28b+=+3%29
.....................
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