Evaluating Expressions with Unknown Variables

Evaluating Expressions with Unknown Variables

Assessment

Interactive Video

Mathematics

6th - 9th Grade

Hard

CCSS
7.EE.A.1, 8.EE.C.7B, 6.EE.A.2C

+1

Standards-aligned

Created by

Amelia Wright

FREE Resource

Standards-aligned

CCSS.7.EE.A.1
,
CCSS.8.EE.C.7B
,
CCSS.6.EE.A.2C
CCSS.8.EE.C.8B
,
The video tutorial covers evaluating expressions with unknown variables. It begins with an example where the expression 3x + 3y + 3z equals 1, and the task is to find the value of 12x + 12y + 12z. The instructor demonstrates factoring and simplifying the expression to find the solution. A second example is presented with 3a + 5b = 2, asking for the value of 15a + 15b. The instructor explains the limitations in solving this problem due to insufficient information. The tutorial concludes with a summary of the concepts covered.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the initial expression given in the problem?

15a + 15b = 2

3x + 3y + 3z = 1

3a + 5b = 2

12x + 12y + 12z = 1

Tags

CCSS.7.EE.A.1

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How can the expression 12x + 12y + 12z be rewritten?

5 times (a + b)

3 times (x + y + z)

15 times (a + b)

12 times (x + y + z)

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the value of x + y + z derived from the first equation?

1

3

4

1/3

Tags

CCSS.6.EE.A.2C

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the final value of 12x + 12y + 12z?

4

1

12

3

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the new expression introduced in the second problem?

3a + 5b = 2

3x + 3y + 3z = 1

12x + 12y + 12z = 1

15a + 15b = 2

Tags

CCSS.7.EE.A.1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What expression are we trying to find in the second problem?

15a + 15b

3x + 3y + 3z

3a + 5b

12x + 12y + 12z

Tags

CCSS.8.EE.C.8B

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why can't we solve for a + b in the second problem?

The equation is incorrect

The constants are too large

The variables are undefined

Not enough information is provided

Tags

CCSS.7.EE.A.1

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