`3x+2=9`

4 Answers | Add Yours

embizze's profile pic

embizze | High School Teacher | (Level 1) Educator Emeritus

Posted on

Solve 3x+2=9:

We use inverse operations to isolate the variable:

3x+2=9   Subtract 2 from both sides (or add -2 to both sides) using the addition/subtraction property of equality.

3x+2-2=9-2
3x=7       Divide both sides by 3 (or multiply by 1/3) using the multiplication/division property of equality.

`(3x)/3=7/3`

`x=7/3`

Check your answer: `3(7/3)+2=7+2=9 ` as required.

Sources:
brokenarsenal's profile pic

brokenarsenal | (Level 2) eNoter

Posted on

Q:3x+2=9

Subtract 2 on both sides

3x=7

You always want to make the variable alone

x =7/3

A:7/3

rsarvar1a's profile pic

rsarvar1a | Student, Grade 9 | (Level 1) Honors

Posted on

To find x, we must isolate it in the equation.

We start with:

3x + 2 = 9

First, we want to move the 2 to the other side of the equation. For this, we to cancel out the 2 and move it to the other side. Since we know that when we apply something to one side of the equation, we must apply it to the other side, we do this to move the 2 out of the left side of this equation:

3x + 2 = 9

3x + 2 - 2 = 9 - 2

Therefore:

3x = 7

Now, we know the value of 3x. To find out the value of x, we must divide both sides of the equation by 3:

3x / 3 = 7 / 3

x = 7 / 3

Therefore, x is equal to 7/3, which is the most accurate way to express the value of x.

We’ve answered 318,915 questions. We can answer yours, too.

Ask a question