Fractions first: clear denominators, then collect x, then isolate x.
1. Why is it useful to combine like terms before solving an equation such as ax+b=cx+d?
2. If a rectangle’s length is 3 cm more than twice its width, which equation models that relationship?
3. Which expression best represents a cost model with a starting fee plus a per-unit rate?
Linear equation — fractions?
Clear denominators before solving.
Solve linear equations — variables?
Isolate the variable on one side.
Hard linear problems — steps?
Distribute, combine, then isolate.
Perimeter problem — formula?
Perimeter = 2(length + width).
Word problem — dimensions?
Translate words into equations for length and width.
Cost word problem — setup?
Express total cost as start + rate×units.
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