Algebra 8th grade
posted by Anon .
3a + 5b = 70
6a + 9b = 135

Multiply both sides of the 1st Eq by 6.
Multiply both sides of the 2nd Eq by 3.
Then add the Eqs.
18a  30b = 420
+18a + 27b = 405
3b = 15
b = 5.
in the 1st Eq, replace b by 5:
3a + 5*5 = 70
3a = 7025 = 45
a = 15 
62ab

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