Question

3x+2y =21
x + 5y=20? ​

Answer 1

Explicación paso a paso:

$3x + 2y = 21 \\ x + 5y = 20 \\ 3x + 2y = 21(1) \\ x + 5y = 20( - 3) \\ 3x + 2y = 21 \\ - 3x - 15y = - 60 \\ - 13y = - 39 \\ y = \frac{ - 39}{ - 13} \\ y = 3 \\ x + 5y = 20 \\ x + 5(3) = 20 \\ x + 15 = 20 \\ x = 20 - 15 \\ x = 5$