1. b+2=p. 4+2=p. 6=p.
2. p/2=a. 6/2=a. 3=a
3. b-a=x. 4-3=x. 1=x
I'm in HS but this seems like it is the answer. If you need more explanation ask.
The answer is $21.40. You first figure out what the discounted price of the sweater is (which is $20). Then you multiply 20 by 1.-7 since the tax on it is 7%. Thus your answer is $21.40
Plug x=3 in the first equation to find y:
4(3)+5y=2
y=-2
so a=-2
Next, plug x=3, y=-2 in the second equation to find b:
6(3)-2(-2)=22
b=22
