diketahui 3x - 3y =9 dan x - 5y = 2!. maka nilai dari 2x + y adalah

3x-3y = 9, bisa dijadikan x-y = 3

x-y = 3
x-5y = 2
----------(dikurang)
4y = 1
y = 1/4

x-y = 3
x = 12/4+1/4
x = 13/4

2x+y = 2(13/4)+1/4 = 26/4+1/4 = 27/4 = 6 3/4

3x-3y=9
x-5y= 2

-18y=3
y=-3

x-5y=2
x-5.-3=2
x+15=2
x=2-15
=-13

2x+y
2.-13+(-3)
=-26-3
=-29