50+ algebra worksheets for 9th Grade on Quizizz | Free & Printable - Free Printable

Let’s solve each question one by one, with clear explanations.

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1. `x + y = 50`

✔ Correct Answer: A — equation

Explanation:
An equation is a mathematical statement that shows two expressions are equal, using an equals sign (`=`). Here, `x + y = 50` has an equals sign, so it’s an equation. An expression does *not* have an equals sign.

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2. `x + y`

✔ Correct Answer: B — expression

Explanation:
This is just a combination of variables and operations, with no equals sign. That makes it an expression. It’s not an equation because there’s no equality being asserted.

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3. `y + 5x - 10`

✔ Correct Answer: B — terms

Explanation:
In algebra, terms are the parts of an expression separated by plus or minus signs. In `y + 5x - 10`, the terms are:
- `y`
- `5x`
- `-10`

So the whole thing is made up of terms. The other options:
- Variables: letters like x, y → but this includes numbers too.
- Constant: just the number `-10`.
- Coefficient: the number in front of a variable, like `5` in `5x`.

So “terms” is the best answer for describing the entire expression.

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4. `2x + y = 1`

✔ Correct Answer: C — coefficient

Explanation:
The question is asking about the “2” in `2x`. In algebra, a coefficient is the numerical factor multiplied by a variable. So in `2x`, `2` is the coefficient of `x`.

Other choices:
- Constant: would be `1` (the standalone number on the right)
- Variable: `x` or `y`
- Term: `2x`, `y`, or `1` — but the question is specifically pointing to the “2”, which is part of a term.

So C — coefficient is correct.

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5. `2x + 3y + 5x = 75`

✔ Correct Answer: A — variables

Explanation:
The question is asking about the letters `x` and `y` in the expression. These are called variables — symbols that represent unknown values.

Other options:
- Coefficient: `2`, `3`, `5` — the numbers in front
- Terms: `2x`, `3y`, `5x`, `75`
- Constant: `75`

So since the question is highlighting `x` and `y`, the correct answer is A — variables.

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6. How many terms in the following expression: `5x + 3y - 15 + x`

✔ Correct Answer: A — 4

Explanation:
Terms are separated by `+` or `-` signs. Let’s list them:

1. `5x`
2. `3y`
3. `-15`
4. `+x` (which is the same as `+1x`)

Even though `5x` and `x` are like terms (can be combined), they are still separate terms before combining. So we count them as 4 distinct terms.

> Note: Sometimes students might think “combine first”, but the question asks “how many terms in the expression” — meaning as written, not simplified.

So A — 4 is correct.

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7. Is the following a expression? `5W`

✔ Correct Answer: A — yes

Explanation:
An expression is any combination of numbers, variables, and operations (like +, -, ×, ÷) — without an equals sign. `5W` is a single term, but it’s still an expression. Even a single number or variable alone is considered an expression.

So yes, `5W` is an expression.

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✔ Final Answers:

1. A
2. B
3. B
4. C
5. A
6. A
7. A

Let me know if you’d like help with the rest of the 20 questions!