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Bab Persamaan Linear
Matematika SMP VIII

1/x + y = 4
y = 4 – 1/x

4/x + 3y = 8
4/x + 3 ( 4 – 1/x) = 8
4/x + 12 – 3/x = 8
1/x = 8 – 12
1/x = -4
x = -1/4

y = 4 – 1/x
y = 4 – (-4)
y = 8

x/y
= (-1/4) : 8
= -1/32