Question

calcule o valor de x em cada figura a seguir:

Answer 1

$a) \\ \\ \frac{15}{x+3} = \frac{10}{x} \\ \\ 15x=10(x+3) \\ \\ 15x=10x+30 \\ \\ 15x-10x=30 \\ \\ 5x=30 \\ \\ x=30\div5 \\ \\ x=6$ 

$b) \\ \\ \frac{x+2}{12} = \frac{x-4}{4} \\ \\ 12(x-4)=4(x+2) \\ \\ 12x-48=4x+8 \\ \\ 12x-4x=8+48 \\ \\ 8x=56 \\ \\ x=56\div8 \\ \\ x=7$