Question

Help please?
y vries directly as x, what is the value of y in these ordered pairs?
(5, 8) and (10, y)

A. y=5/2 B. y=16
C. y=2.5 D. y=4

Answer 1

Direct Variations

Answer 2

So we have y varies directly as x
That means
for some constant k
y=kx

We know one point on this line (5,8)
So use this point to find k by replacing y with 8 and x with 5

Answer 3

So once you find k
you will be able to replace that k in
y=kx
And use this line to find y for any x

Answer 4

So b?

Answer 5

Sorry Im not that good at math

Answer 6

yes b is right
do you understand how you got b?

Answer 7

yes thank you very much @myininaya