Winston owns a coffe cart. He charges $1.50 for a cup of coffe , and it costs him $0.50 to make each cup of coffe plus $100 a da
1 answer:
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Answer:
y = 6
Step-by-step explanation:
Given that y varies directly with x then the equation relating them is
y = kx ← k is the constant of variation
To find k use the condition y = 3 when x = 9, then
k = =
=
, thus
y = x ← equation of variation
When x = 18, then
y = × 18 =
= 6