Finding the Y-Intercept with Two Points

Write an equation for the graph

• y = x + 3

• y = -x -3

• y = -2x - 3

• y = -1 - 3

Remember equations are written as y=mx+b. Create the equation by finding the slope from rise/run and the y-intercept by looking at where it crosses the y-axis. You can also create an equation by making a List & Spreadsheet, Data & Statistics, Menu 4, 6, 1.

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AI.9.2.B

To create an equation when given two points you will need to make a List & Spreadsheet, Data & Statistics, Menu 4,6,1. Don't forget to turn the fractions into decimals by typing the fraction and pressing CTRL Enter.

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AI.9.2.B

Remember equations are written as y=mx+b. Create the equation by finding the slope from rise/run and the y-intercept by looking at where it crosses the y-axis.

You can also create an equation by making a List & Spreadsheet, Data & Statistics, Menu 4, 6, 1.

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AI.9.2.C

Find the y-intercept of the line that passes through the given  pair of points:  (-2, -3), (4, 3)

• b = 3

• b = 2

• b = 1

• b = -1

Write the y-intercept for the function that passes through the points (−2, 6) and (2, 7). Change it to a decimal.

A line passes through the coordinates (2,6) and (3,3). What is the y-intercept of this line?

• b = -9

• b = -6

• b = 6

• b = 12

Answer explanation

To find the y-intercept, insert the value for slope in for m and one of the coordinates in for x and y. Use the equation y = mx + b and solve for b. 

What is the y-intercept for the function that passes through the points (24, 28) and (8, 8)?

Remember equations are written as y=mx+b. Create the equation by finding the slope from rise/run and the y-intercept by looking at where it crosses the y-axis. You can also create an equation by making a List & Spreadsheet, Data & Statistics, Menu 4, 6, 1.

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AI.9.2.C

Which equation in standard form represents this graph?

• -6x +4y = -12

• 4x - 6y = -24

• -6x - 4y= -24

• -6x + 4y = -24