Finding Value of Unknown Variable

Algebra is about solving for X

• True

• False

Answer explanation

Advanced algebra is about solving for X, where X is the variable, or unknown value or number.

But X is just a universally agreed letter used in Algebra. In reality, any letter can be a variable.

Tags

CCSS.7.EE.B.4A

What is the purpose of using variables in algebra?

• To represent unknown values

• To make equations more colorful

• To confuse students

Tags

CCSS.6.EE.B.6

In the equation 3x = 9, what is the value of x?

• 1

• 2

• 3

Answer explanation

When placed directly to a number, letters become an algebraic expression that tells us 'how many' of the numeral there are.

So, 3x is a simplified expression for 3 + 3 + 3, or three 3s.

Tags

CCSS.6.EE.B.7

If x = 4, what is the value of 2x + 3?

• 8

• 11

• 10

• 9

Answer explanation

Here x = 4, so the expression 2x becomes 2 + 2 + 2 + 2, or four 2s, or 2 x 4.

So we rewrite the number sentence as:

2 + 2 + 2 + 2 + 3 = 11

or

(2 x 4) + 3 = 11 (because 2 x 4 is 8, and so it becomes 8 + 3 = 11.

Tags

CCSS.6.EE.A.2C

13 + x = 20

What is the value of x?

• 7

• 9

• 8

• 4

Tags

CCSS.1.OA.D.8

__________ means to replace a variable for a given value.

• Evaluate

• Simplify

• Solve

• Substitution

Tags

CCSS.6.EE.A.2C

a _______ is the value of the variable that makes an equation true.

• solution

• answer

• constant

• variable

Tags

CCSS.6.EE.B.5

A __________ is a letter that represents an unknown value.

• constant

• coefficient

• variable

• equation

Tags

CCSS.6.EE.A.2B