Selesaian dari 1/y +2/x = 4 dan 3/y – 1/x= 5 adalah

Selesaian dari 1/y +2/x = 4 dan 3/y – 1/x= 5 adalah…
a. x= 1/2,y=-1
b. x= -1/2,y=-1
c. x=1/2,y=1
d. x=1, y=1/2

Jawaban
1/y + 2/x = 4 ⇒kali 3
3/y – 1/x = 5 ⇒kali 1

3/y + 6/x = 12
3/y – 1/x = 5
—————— –
7/x = 7
x = 7/7
x = 1

1/y + 2/x = 4
1/y + 2/1 = 4
1/y + 2 = 4
1/y = 4 – 2
1/y = 2
y = 1/2

HP = { 1, 1/2 }

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