Area = Length x Width
so, 88 = (something) x 8
Can you work out the something using mental math?
Five eighths times seven elevenths =
5/8 x 7/11 =
35/88
4x - 9 = 2x
Solve for x.
4x = 2x + 9
2x = 9
x = 4.5
We can plug 4.5 into the original equation to verify if it's correct.
4x - 9 = 2x
4(4.5) - 9 = 2(4.5)
18 - 9 = 9
The equation is true, and so x = 4.5