Slope Intercept Form NOTES

1. ​Solve for Slope (m)

2. use ordered pair to substitute with (x) and (y)

3. Solve for y-intercept (b)

​y-intercept

 
Now that you solved for slope you will put it back into your formula and use one of the ordered pairs to solve for b.
slope= 1/3
y=1/3x+b
In this case we will use the point (3,4) where my x=3 and y=4
so substitute the x and the y with the ordered pairs in the slope intercept formula.

y=1/3x+b
4=1/3(3)+b
Plug the formula in your CALCULATOR
y=
y₁₌4
y₂₌(1/3)(3)+x
2nd, Trace, 5, Enter, Enter, Enter
(if you cannot see both lines crossing ZOOM, 3, Enter until you are able to see lines cross.
(x=3) y-intercept =3
Now that you have both your slope and y intercept you can now plug those numbers in your formula and create an equation.
EQUATION= y= 1/3x+3

 
Now that you solved for slope you will put it back into your formula and use one of the ordered pairs to solve for b.
SLOPE (m): 55/2
y=55/2x+b
In this case we will use the point (4,110) where my x=4 and y=110
so substitute the x and the y with the ordered pairs in the slope intercept formula.

y=55/2x+b
110=55/2(4)+b
Plug the formula in your CALCULATOR
y=
y₁₌110
y₂₌(55/2)(4)+x
2nd, Trace, 5, Enter, Enter, Enter
(if you cannot see both lines crossing ZOOM, 3, Enter until you are able to see lines cross)
x=0 Y-Intercept (b): (0,0)
Now that you have both your slope and y intercept you can now plug those numbers in your formula and create an equation.
EQUATION: y= 55/2x

Finish the Group Practice with your table!!!
Make sure that everyone in your table knows what we are doing and how to find the equation, slope and y-intercept!!! Check each others work and calculators.

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