Question

resolva a equação linear 6x+y=31 5x+2y=34​

Answer 1

$6x + y = 31 \\ 5x + 2y = 34 \\ \\ y = 31 - 6x \\ \\ 5x + 2(31 - 6x) = 34 \\ 5x + 62 - 12x = 34 \\ 5x - 12x = 34 - 62 \\ - 7x = - 28 \\ 7x = 28 \\ x = \frac{28}{7} \\ x = 4 \\ \\ y = 31 - 6x \\ y = 31 - 6.4 \\ y = 31 - 24 \\ y = 7$

S= {4, 7}