Ada GK yg bisa bantuin x + 2y =30 3x + 4y =45 ?

Jawaban:

x + 2y = 30 |×2| 2x + 4y = 60

3x + 4y = 45 |×1 | 3x + 4y = 45

—————– –

-x = 15

x = -15

2x + 4y = 60

2(-15) + 4y = 60

-30 + 4y = 60

4y = 90

y = 90/4

y = 45/2