tlg nomor 24-25 pakai cara

24.3x + 4y = 14 × 5
5x + 7y = 28 × 3

15x + 20y = 70
15x + 21y = 84
-----------------------
-y -14
y = 14
x = -14
(-14,14) (a)

25. 7x + 5y = 2 ×5
5x + 7y = -2 × 7

35x + 25y = 10
35x + 49y = -14
__________
-24y = 24
y = -1
x = 1
x1 - y1 = 1 -(-1)
= 2