Question

Penyelesaian dari sistem persamaan 2x-5y=18 dan 5x-3y=26adalah x dan y. Nilai 4x-7y adalah..... mohon bantuannya

Answer 1

2x - 5y = 18  *5 
5x - 3y = 26  *2

10x - 25y = 90
10x - 6y = 52
-19y =  38
y = -2

2x - 5(-2) = 18
2x + 10 = 18
2x = 8
x = 4

4x - 7y
4(4) - 7(-2)
16 + 14 = 30 

Answer 2

10x - 25y = 90
10x - 6y = 52
-19y =  38
y = -2
2x - 5(-2) = 18
2x + 10 = 18
2x = 8
x = 4
4x - 7y
4(4) - 7(-2)
16 + 14 = 30
semoga membantu
jadikan yg terbaik y