If y is directly proportional to x, and y=46 when x=4, what is the value of x when y=23?

x=2

Step-by-step explanation:

if they are proportional that means whatever you do to Y will also happen to X and in this instance y=46 got divided by 2 for it to be y=23

so you do the same to x

x=4 divided by 2 is x=2

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!