tolong jwb pake cara ! penyalesaian dr persamaan [tex]2x + 3y = 4 \: dan \: x - 3y = - 7adalah \: x = a \: dan \: y = b \: .nilai \: 4a - 3b \: adalah[/tex]

2x + 3y = 4 |× 1
x - 3y = -7 |×2

2x + 3y = 4
2x -6y = -14
----------------- -
9y = 18
y = 2
2x + 3y = 4
2x + 3 (2) =4
2x =4 - 6
x = -2/2 = -1
jadi 4a -3b =
4 (-1) -3 (2) = - 10