Question

Tolong dibantu yah kk ^_^
jika (x,y) merupakan penyelesaian sistem persamaan 2x + y - 5 = 0 dan 3x - 2y - 11 = 0, maka nilai (x+y)pangkat 2 sama dengan?

Answer 1

2x + y - 5 = 0 => 2x + y = 5 |x2|
3x - 2y - 11 = 0 => 3x - 2y = 11 |x1|

4x + 2y = 10
3x - 2y = 11
---------------- +
7x = 21 => x = 3

2x + y = 5
=> 2(3) + y = 5 => y = -1

(x + y)^2 = (3 + (-1))^2 = (2)^2 = 4