Diketahui sistem persamaan linear 2x+3y=9 dan x+2y=7.nilai 4x-5y adalah

x=4,5
y=3
4x-5y= 4,5(4)-3(5)
=18-15
=3

2x + 3y = 9
2x + 4y = 14 --
-------------------
y = 5

2x + 3.5 = 9
2x = 9-15
2x = -6
x = -3

~ 4.(-3) - 5. (5)
= -12-25 = -37