Write Linear Equations from Graphs, Tables, and Verbal, A.2C(R)

​Writing the Equation of a Table:

​Steps:
1.) Find the slope.
2.) Plug in the slope (m) and a point (x, y) into the Slope-Intercept formula (y = mx + b).
3.) Solve for b.
4.) Re-write equation (plug in m and b).

​Example:

1.) Go to the Home Screen and create a New Document. Answer No to the save question.
2.) Press 4 for Add Lists & Spreadsheets.
3.) Scroll up to the A column and type x; Then type y in the B column.
4.) Type your 2 points in the table.
5.) Press Menu/4-Statistics/1-Stat Calculations/3-Linear Regression, mx+b
6.) Double click under the X-list to select x; then click on the Y-list to select y.
7.) Press Enter. The calculator will tell you the m (slope) and b (y-intercept).

Multiplication Key Words:

If you can tell that a number is being multiplied, then that number is your slope, m, because y = mx + b.

• ​Each

• Every

• Per

• Monthly/Hourly/Annually/Daily

• Of

• Rate/Rate of Change

Addition/Subtraction Key Words:

If you can tell that a number is being added or subtracted, then that number is your y-intercept, b, because y = mx + b.

• ​Starting point

• Initial value

• Add/plus

• Increase

• Together

• Deposit (+)

​Addition:

​Subtraction:

• ​Difference

• Less than

• Deduct/withdraw

• Decrease

• Left

• Remaining

• Discount