Unit 2D Review

Unit 2D Review

Try the activating question

Multiple Choice

What is the solution to this system of equations?

• (6, 9)

• (3, 6)

• (6, 3)

• (0, 3)

Elimination:

5x + y = 15

3x + 2y = 9

Multiple Choice

Solve for x by Elimination:

3x + 3y = 15

-2x + 3y = -5

• x = 3

• x = 4

• x = 5

• x = 10

Substitution:

x = 2y - 1

3x - 2y = -3

Multiple Choice

Solve for x using Substitution:

y = x + 1

4x + y = 6

• x = 1

• x = -1

• x = 2

• x = 4

How many solutions does this system of equations have?

Solve using substitution or graphing

y = 12x + 17

y = 9 + 12x

How many solutions?

• Two lines with the same slope but different y-intercepts

• Two lines with different slopes but the same y-intercept

• Two lines with the same slope and same y-intercept

• Two lines with different slopes and different y-intercepts

Multiple Choice

How many solutions does this system of equations have:

12x - 18 = 6(2x - 3)

• One Solution

• No Solutions

• Infinitely Many Solutions

Multiple Choice

Which point is a solution to this system of inequalities?

• (2, 2)

• (0, 2)

• (3, 5)

• (-4, -4)

Walter lived in Portugal and Brazil for a total period of 14 months in order to learn Portuguese.

He learned an average of 130 new words per month when he lived in Portugal and an average of 150 new words per month when he lived in Brazil. In total, he learned 1920 new words.

How long did Walter live in Portugal, and how long did he live in Brazil?