Question

Dari persamaan 2x - 3y = -2 dan 3x + 2y = -2. maka nilai -x² + 2y adalah

Answer 1

Verified answer

2x-3y = -2 |×3|
3x+2y = -2 |×2|

6x-9y = -6
6x+4y = -4
________ _
-13y = -2
y = 2/13

3x+2y = -2
3x+2(2/13) = -2
3x+4/13 = -2
3x = -26/13 - 4/13
3x = -30/13
x = -30/13 : 3
x = -30/13 × 1/3
x = -30/39 = -10/13

-x²+2y = -(-10/13)²+2(4/13)
= -(100/169)+8/13
= -100/169+8/13
= -100/169+104/169
= 4/169

semoga membantu yaa:)