Question

Sistema de equações

X+4=4
3x+2y=9

Answer 1

{X +4y = 4
{3x +2y = 9 ×(-2)

{x +4 = 4
{-6x -4y = -18

-5x = -14 ×(-1)
5x = 14
X = 14⁄5

x +4y = 4
14⁄5 +4y = 4
14⁄5 + 20y/5 = 20/5
14 + 20y = 20
20y = 20 -14
20y = 6
Y = 6⁄20 = 3⁄10

S = {14⁄5, 3⁄10}