"PACK OF 10" with 7/8 foot long pieces of track "PACK OF 6" with 1 and 1/2 feet pieces of track
"PACK OF 8" with 4/5 foot pieces of track
"PACK OF 12" with 3/4 foot pieces of track
"PACK of 10" with 3/5 foot pieces of track

problem:

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

f(5/2) = 10/3

i hope this !

step-by-step explanation:

step 1: solve one of the equations for one of the variables. let's solve the first equation for y:

step 2: substitute that equation into the other equation, and solve for x.

step 3: substitute x = 4 x = 4 x=4 into one of the original equations, and solve for y.