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3 years ago

If y is directly proportional with x and y = 36 when x = 30, what is the value of y when x = 40?

Mathematics

1 answer:

vivado [14]3 years ago

3 0

Answer:

y = 48

Step-by-step explanation:

given y is directly proportional to x then the equation connecting them is

y = kx ← k is the constant of proportionality

To find k use the condition y = 36 when x = 30

k = $\frac{y}{x}$ = $\frac{36}{30}$ = $\frac{6}{5}$

y = $\frac{6}{5}$ x ← equation of proportionality

When x = 40 then

y = $\frac{6}{5}$ × 40 = 48

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