Whos good with proofs ?

given: 7y−84=2y+61

prove: y=29

step reason

7y−84=2y+61

5y−84=61

5y=145

y=29

find the reasons with these below

multiplication property of equality

symmetric property

simplify

given

division property of equality

distributive property

addition property of equality

subtraction property of equality

Which simplifys to a+ b? a-(1-b)+1 -(1-a)-b+1 (a--1) -1)+1

If the scale factor between two circles is 2x/5y what is the ratio of their areas?

Scenario: susan wants to make 2 square flags to sell at a crafts fair. the fabric she wants to buy is 3 meters wide. she doesn't want any fabric left over. what's the least amount of fabric she should buy? question: which equation will susan solve her problem? note: let x represent the length of 1 side of the flag. options: 1) 2x^2 = 4x 2) 8 +2x = 2(4x) 3) 2 * 2 = 4 * 2 4) 4x^2 -2x = 0