Question

Jika x dan y memenuhi system persamaan 3x-y=16 dan x+y=12,maka x+2y adalah pakai cara subtitusi

Answer 1

Verified answer

3x -y= 16
x + y = 12➡ x= 12-y

3x-y = 16
3(12-y)-y = 16
36 -3y -y = 16
-4y = 16-36
-4y = -20
y = -20/-4
y = 5

x + y = 12
x + 5 = 12
x = 12-5
x = 7

jadi
x + 2y =
7+(2×5) = 7+10 = 17

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