Question

na equação 3x/2-1/4y=7/8, se y=-2 então, o valor de x é

Answer 1

$\frac{3x}{2} - \frac{1}{4y} = \frac{7}{8} \\ \\ \frac{3x}{2} - \frac{1}{4*(-2)} = \frac{7}{8} \\ \\ \frac{3x}{2} - \frac{1}{(-8)} = \frac{7}{8}\\ \\ \frac{-24x}{2}- \frac{8}{8} =-7 \\ \\ \frac{-24x}{2}- 1 =-7 \\ \\ \frac{-24x}{2} =-6 \\ \\ -24x =-12 \\ \\ x= \frac{(-24)}{(-12)} \\ \\ x= \frac{1}{2}=0,5$