Question

alguem me ajuda?? o gabarito é 6,9

Answer 1

5/8=x/4
8x=20
x=20/8
x=10/4=5/2=2,5

2,5/4=2,75/y
2,5y=11
y=11/2,5=22/5=4,4

2,5+4,4=6,9

Answer 2

$\frac{5}{8} = \frac{x}{4} \\ \\ 20 = 8x \\ \\ x = \frac{20}{8} \\ \\ x = \frac{5}{2} \\ \\ \\ \frac{5}{8} = \frac{2.75}{y} \\ \\ \frac{5}{8} = \frac{ \frac{11}{4} }{y} \\ \\ \frac{5}{8} = \frac{11}{4y} \\ \\ 2y = 88 \\ \\ y = \frac{22}{5} \\ \\ \\ x + y = \frac{5}{2} + \frac{22}{5} = > \\ \\ x + y = \frac{25 + 44}{10} \\ \\ x + y = \frac{69}{10} \\ \\ x + y = > 6.9$