Diket system persmaan 4x+3y=23 dan 5x-7y = -25. Nilai dari - 3x+6y. Adalah.. Tolong jwb dgn caranya. ☺️

4x + 3y = 23 | 5 |
5x - 7y = -25 | 4 |
_______________
20x +15y = 115
20x -28y = -100
________________-
43y = 215
y = 215/43
y = 5

4x + 3y = 23
4x + 3(5) = 23
4x + 15 = 23
4x = 23 - 15
4x = 8
x = 8/4
x = 2

-3x + 6y = -3(2) + 6(5) = -6 + 30 = 24

4x+3y=23 ×5
5x-7y=-25 ×4

20x+15y=115
20x-28y=-100
___________ -
43y=215
y=5

4x+3(5) =23
4x=23-15
4x=8
x=2


jadi nilai -3x+6y
-3(2)+6(5)
-6+30= 24