The answer would be -11 z - 3
48" means 48 inches
anyway
the perimiter is the distance around or the sum of the sides
perimiter=48=x+3+4x-1+2x-3=7x-1
48=7x-1
add 1 to both sides
49=7x
divide both sides by 7
7=x
x+3=7+3=10
4x-1=4(7)-1=28-1=27
2x-3=2(7)-3=14-3=11
the sides are 10", 27" and 11"
x=7
Y
y=mx
Where m is a constant of variation;
y=8, x=2
8=2m
m=8/2
m=4
y=4x
When x=10
y=4(10)
y=40