First we need slope


Put D co-ordinates on y=mx+b




Now
slope intercept form.

Answer: 23/18
Step-by-step explanation:
Answer:
He will save 24 dollars.
Step-by-step explanation:
First do 70+24=94
Then do 180-94=86
Next 86+54=140
Then 180-140=40
Next 40+80=120
Lastly 180-120=60
X=60