If y varies directly as x, and y =-4 when x=8, find y when x=3

Another way of looking at it!

y

=

10

Explanation:

This is a ratio question in disguise.

By parts of the question:

"When y varies directly with x"

→

y

x

"

"if y=8 when x=4"

→

.

.

y

x

=

8

4

"how do you find y when x=5"

→

y

x

=

8

4

=

y

5

so

y

=

8

×

5

4

=

10

This is the same thing as using 'k' in the other solution

Step-by-step explanation:

f(x) = - 2/3x + 5; f(5/2)

substitute 5/2 in for x:

f(5/2) = -2/3(5/2) + 5

simplify the right side:

f(5/2) = -5/3 + 5

f(5/2) = 10/3

answer:

f(5/2) = 10/3

i hope this you!

step-by-step explanation: