Suppose y varies directly with x. write an equation if y=-15 when x=-18.

y = × x

Step-by-step explanation:

The standard format of a directly proportional equation goes by the format of

y = k × x

The question asks us to write an equation if y = -15 when x = -18 and y varies directly with x

So we substitute the values y = -15 and x = -18 in the equation y = k × x

K = constant, we have to work this out

-15 = k × -18

k × - 18 = -15

k =

So then we put this back into the original y = k × x to find our final equation

y = × x

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