Question

se x+y+21/10 e x/y= 5/16 determine x e y

Answer 1

x+y=21/10           x=21/10-y
x/y=5/16

21/10-y/y=5/16

5y=168/5-16y
5y+16y=168/5
21y=168/5
y=168/5 / 21
y=168/5.1/21
y=168/105
y= 8/5

x+y=21/10
x+8/5=21/10
x=21/10-8/5
x=21/10 - 16/10
x=5/10
x=1/2