Question

The value of y varies directly with x, and y = 48 when x = 16. Find y when x = 176.

Answer 1

I do these a little different then most......if it varies directly u can make a proportion

16/48 = 176 / y
cross multiply
(16)(y) = (48)(176)
16y = 8448
y = 8448/16
y = 528 <==

and notice that 16/48 and 176/528 both equal 0.3333 because proportions are nothing but equivalent fractions

Answer 2

Try to find what y is when x is equal to one.

48/16= 3

So, when x is 1, y is 3.

(1,3)

All you need to do is multiply 176 by 3 for the correct value of y.

176*3= 528

When x= 176, y= 528. (176,528)

I hope this helps!
~cupcake