Answer:
y=1/2x+5
Step-by-step explanation:
y=mx+b
m is slope so the slope is 1/2.
It is linear because the ratio of the change in the final cost compared to the rate of change in the price tag is constant
a) price markup $0.60
b) percent marked up 180%
Amount marked up:
1.35 - 0.75 = $0.60
Percent markup:
0.75x = 1.35
x = 1.8 or 180%