Penyelesaian dari 3/2x-1/2 dan 1/2x+1/4y=-4 adalah x =a dan y=b . nilai a-2b adalah

3/2x – 1/2 = 0
3/2x = 1/2
x = 1/2 ÷ 3/2
x = 1/2 × 2/3
x = 2/6
x = 1/3

1/2x + 1/4y = – 4
1/2 (1/3) + 1/4y = – 4
1/6 + 1/4y = – 4
1/4y = – 4 – 1/6
1/4y = – 4/1 – 1/6
1/4y = – 24-1/6
1/4y = -25/6x
y = -25/6 ÷ 1/4
y = -25/6 × 4/1
y = -100/6
y = -50/3

a – 2b
1/3 – 2(-50/3)
1/3 + 100/3
101/3
atau 33,66