2 ENR: IXL Skills Intro

2 ENR: IXL Skills Intro

by Allison Gilbert

Solve the absolute value equations

Multiple Choice

What does absolute value mean?

• Everything is positive

• Everything is negative

• Distance away from zero

Solving absolute value equations

When solving absolute value equations, it is important to understand the definition of absolute value.

|x| = 5

When solving the above equation, remember that absolute value is a number's distance from zero on the number line. If |x|=5, what number or number is five units away from zero on the number line? That could be 5 or -5. The equation has two answers: x = 5 and x = -5.

The 4 Steps

When solving an absolute value equation, there's a four step process to consider.

1. Isolate the absolute value
2. Write two equations
3. Solve the two equations
4. Check your answers (sometimes one or both values do not work)

Fill in the Blank

Solve |x - 1| = 3

Type your answers with a comma between them. Do not use a space.

Fill in the Blank

Solve 2|x +7| - 1 = 9

Separate your answers with a comma. Do not use spaces between the numbers.

Scatter Plots: Line of Best Fit

April 28, 2021

Multiple Choice

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

Multiple Choice

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

Multiple Choice

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

Multiple Choice

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• There is no line of best fit for this graph because there is no trend.

Multiple Choice

Select the statement that best describes the line.

• The line is the line of best fit.

• The line is NOT a line of best fit because it does not pass through two points.

• The line is NOT a line of best fit because it does not go through the middle of the data set.

• The line is NOT a line of best fit because it does not go through the origin.

Multiple Choice

Which of the following shows a positive correlation between number of hours studied and test scores.

Multiple Choice

What trend do you notice about the age of the student and their shoe size.

• As their age increases, their shoe size increases.

• As their age increases, their shoe size decreases.

• As their shoe size decreases, their age increases.

• There is no trend in this data.