Simple just subtract and u get-74.85
3a + 6b = 45
2a - 2b = -12....multiply by 3
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3a + 6b = 45
6a - 6b = - 36 ...(result of multiplying by 3)
---------------add
9a = 9
a = 1
3a + 6b = 45
3(1) + 6b = 45
3 + 6b = 45
6b = 45 - 3
6b = 42
b = 7
solution is : (1,7)
15/7*7/2*4/5=15/2*4/5=60/10=6
Answer is B.
8^1/3 = (2^3)^1/3 = 2
