Question

resolva os sistemas
X+2y=7
4x-y=10​

Answer 1

{x+2y=7

{4x-y=10×(2)

{x+2y=7

+ {8x-2y=20

$9x = 27 \\ x = \frac{27}{9} \\ x = 3$

$y = 4x - 10 \\ y = 4.3 - 10 \\ y = 12 - 10 \\ y = 2$

S={3,2}