jika 2x+5y=23dan 5x-2y=14 . maka nilai dari 4x+3y adalah

jawab
persamaan liner

2x+ 5y = 23.....kali 5
5x -2y = 14 .....kali 2

10x + 25y = 115
10x - 4y = 28 .......(-)
29y = 87
y = 3

2x+ 3y = 23
2x+ 9 = 23
2x = 14
x = 7

4x+ 3y = 4(7) + 3(3) = 28 +9= 37