If 8 ∙ 2x = 5(y+8), then when y = -8, x =
Options
A) -4 B) -3 C) 0 D) 4 E) 8
Solution:   8 ∙ 2x = 5(y+8).   or, 8 ∙ 2x = 5(-8+8).   or, 2x = 50.   or, 2x = 1 [anything to the power 0 is 1 then, 50 = 1].   Taking log on both sides,   log 2x = log 1.   or, x log 2 = 0 [since log 1 = 0].   or, x = 0/log 2 [dividing log 2 on both sides].   Therefore, x = 0.   Answer: 0
<result>C</result>
If 8 ∙ 2x = 5(y+8), then when y = -8, x =