Question

{2x-y elevado ao quadrado=1
{3x + y=4

Answer 1

2x - y² = 1
3x + y = 4 >>>>   x =   ( 4 - y)/3 ****
substitui  na primeira

2 ( 4 - y)/3  - y² = 1
( 8 - 2y)/3  - y²/1 = 1/1
mmc = 3
( 8 - 2y) - 3y² = 3
-3y² - 2y + 8 - 3 = 0
- 3y² - 2y + 5 = 0
3y² + 2y - 5 = 0
delta = 4 +60 = 64 ou +-V64 = +-8 ****

y = ( -2 +-8)/6
y1 = 6/6 = 1 ***
y2 = -10/6 = - 5/3 ***

x1 =( 4 -  1)/3
x1 = 3/3 = 1 ***

x2 =  [( 4/1 - (-5/3)]/3
x2 = [ 4/1 + 5/3)/3
x2 = [ ( 12 + 5)/3 ] / 3
x2 = ( 17/3)/3
x2 = 17/3 : 3/1 = 17/3 * 1/3 = 17/9 ***