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y is directly proportional to x.
When y = 30, x = 6
a) Work out an equation connecting y and x.
b) Work out the value of y when x = 12.

Answer 1

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Answer:

a) y = 5x

b) y = 60

Explanation:

a) The equation for a proportional relationship is ...

y = kx

We can use the given values for x and y, and solve for k:

k = y/x = 30/6 = 5

The equation is ...

y = 5x

__

b) For x=12, the value of y is ...

y = 5·12

y = 60