Answer:
B. 12x + 12 = 7x + 56
Explanation:
[tex]Given : \ \sf \dfrac{12}{ x +8} = \dfrac{7}{x + 1}[/tex]
cross multiply formula: if [tex]\sf \dfrac{a}{b} = \dfrac{c}{d}[/tex] then [tex]\sf ad = cb[/tex]
[tex]\sf 12(x +1) = 7(x + 8)[/tex]
distribute inside parenthesis
[tex]\sf 12x + 12= 7x + 56[/tex]
collect like terms
[tex]\sf 12x -7x = 56 - 12[/tex]
simplify the following
[tex]\sf 5x = 44[/tex]
dividing both sides by 5
[tex]\sf x = 8.8[/tex]
