Question

Find the value of k if it is known that the graph of y=kx goes through:

Answer 1

In y=kx , subst. -30 for x and 3 for y.  Then solve the resulting equation for k:

3 = k(-30).

Dividing both sides by -30, we get:

-3/30 = -1/10 = k

The constant of proportionality is k = -1/10.