Question

Given that

R=9x+8y
Find x when y=8 and R=4
Give your answer as an improper fraction in its simplest form.

Answer 1

`-(20)/(3)`

Explanation:

`R=9x+8y\\\\4=9x+8(8)\\\\9x+8(8)=4\\\\9x+64=4\\\\9x+64-64=4-64\\\\9x=-60\\\\(9x=-60)/(9) \\\\x=-(60)/(9)=\boxed{-(20)/(3)}`

Hope this helps.