Question

Resolva o sistema de equação :{2x-y2=1
{3x+y=4

Answer 1

{2x-2y=1
{3x+y=4

=> 2 * {3x+y=4
=> {6x + 2y= 8

{2x-2y=1
{6x+2y=8

=>8x=9
=>x=9/8 => x=1,125

=>2x-2y=1
=>2.(9/8)-2y=y
=>2,25-2y=y
=>3y=2,25
=>y=2,25/3
=>y=0,75

S={1,125;0,75}