Since you like to steal points instead of actually helping people who need it the most you don't get an answer.
Step 1: Add 3 to both sides.
2x-3+3=7+3
2x=10
Step 2: Divide both sides by 2.
2x/2=10/2
x=5
Answer:

Step-by-step explanation:
Given


Required
Find a and b
Substitute
for x and y in 



Rewrite as:

The above implies that (a) is correct;
Hence:

So, the equation is:

Answer:
What I came up with- 2.22 to 1
Step-by-step explanation:
222 red / 100 blue = 2.22
2.22 more red pieces of construction paper compared to the blue pieces