Its the transitive property. Transitive means that is a=b and b=c then a=c. It matches with what they're asking for.
5(a - 2b) - 3(a - 2b) |use distributive property: a(b - c) = ab - ac
= 5a - 10b - 3a + 6b
= (5a - 3a) + (-10b + 6b)
= 2a - 4b
Answer:

Step-by-step explanation:

→ Multiply everything by 2

→ Expand out the bracket

→ Simplify

→ Divide both sides by 4 to isolate x

By intercepts they mean the x and y intercept .
X is on the horizontal line
Y is on the vertical line