Question

x+5y=7
3x-5=1
método da adição

Answer 1

$\\x+5y=7 \\x=7-5y \\ \\3x-5=1 \\3.(7-5y)-5=1 \\21-15y-5=1 \\21-5-1=15y \\15y=15 \\1y= \frac{15}{15} = 1 \\ \\ \\x+5y=7 \\x=7-5y \\x=7-5.1 \\x=7-5 \\x=2$