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

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

anonymous · Answer

Direct Variations

myininaya · Answer

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

myininaya · Answer

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

anonymous · Answer

So b?

anonymous · Answer

Sorry Im not that good at math

myininaya · Answer

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

anonymous · Answer

yes thank you very much @myininaya