Question 701687
"y varies directly as x," means y = kx for some number k


y = kx


30 = k*4 ... plug in x = 4 and y = 30


30/4 = k


15/2 = k


k = 15/2


-------------------------------------------------------


y = kx


y = (15/2)x


y = (15/2)*(-10)


y = -150/2


y = -75


So y = <font color="red">-75</font> when x = -10