Grade 9 · Algebra 1
The algebra, geometry, and SAT items US students search most. Written in American English for students, parents, and teachers in the United States.
Open a card to see the answer. These are original practice items for US elementary students — not a state test copy.
Answer: subtract 6 from both sides
Undo addition before undoing multiplication.
Answer: 4
Divide both sides by 2.
Answer: straight line
Linear equations graph as lines.
Answer: an ordered pair (x, y) that makes it true
Plug in both values to check.
Answer: y = 3x − 2
y = mx + b.
Answer: 3
Subtract 5, then multiply by −1 — or add x and subtract 2.
Answer: all real x
Both sides are the same expression.
Answer: no solution
1 cannot equal 5.
Answer: one, none, or infinitely many solutions
Lines can cross, be parallel, or be the same line.
Answer: solve one equation for a variable, then plug into the other
Useful when a variable is already isolated.
Answer: coefficients are opposites or easy to match
Add or subtract to cancel a variable.
Answer: 3
Add the equations: 2x = 6.
Answer: no solution
Same slope, different intercepts.
Answer: infinitely many solutions
Every point on the line works.
Answer: the intersection point
Both equations are true there.
Answer: 2
2x + 3 = 7 → 2x = 4.
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