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Writing Equations of a Line
Y = mX + b m = slope of lineb = y intercept/ starting point(X,Y) = coordinates
Steps 1. Plot 1st point on Y- intercept 2. Plot slope from 1st point3. connect points with ruler4. sign line at end
Graph y = 1/2 x -2
X Intercept =
Y Intercept =
Writing Equations of a Line
Y = mX + b m = slope of lineb = y intercept/ starting point(X,Y) = coordinates
Steps 1. Plot 1st point on Y- intercept 2. Plot slope from 1st point3. connect points with ruler4. sign line at end
Y = 2/1 X -3
Finding equation of a line with given slope
and 1 point
Y = m x + bSlope = 2
(0,4)
Steps
1. Plug given points into equation.
2. Solve for b.
3. Write equation.
Slope = 1/2
(2,1)
1. Plug given points into equation.
2. Solve for b.
3. Write equation.
Graph 6y < 6 x -12 Using table of values.
X y
X Intercept =
Y Intercept =
Test Point (0,0) and Shade
Graph -3y > 1 x +9 Using table of values.
X y
X Intercept =
Y Intercept =
Test Point (0,0) and Shade
Graph y > 1/2 x -2 Using a table of values.
X y
X Intercept =
Y Intercept =
Graphing InequalitiesTranslate into equation1. Y = 1/2 x - 22. Fill in table of values3. Graph line4. Shade after testing point
Madeline spent 120 minutes working on an English essay. On Tuesday, she spent 20 minutes linger than on Monday, and on Wednesday, she spent rwice as long as she did on Tuesday. How many minutes did she spend working on the essay each day if she finished on Wednesday?
Given 2 points graph a linear equation
Y2 - Y1
Slope = ______ ________
X2 - X1
Steps:
1. Find Slope
2. Sub 1 point and slope into equation.
3. Solve for b
4. Rewrite equation in proper form.
5. Graph
(1, 3) (3,4)x y x y
m=
b=
Write in slope-intercept form.
x + y = 12 4x -3y = 0
m= m=b= b=
Finding equation of a line with given slope and 1 point
Slope = 2 (0, 4)
Steps
1. Plug given points into equation.
2. Solve for b.
Given 2 points graph a linear equation
Y2 - Y1
Slope = ______ ________
X2 - X1
Steps:
1. Find Slope
2. Sub 1 point and slope into equation.
3. Solve for b
4. Rewrite equation in proper form.
5. Graph
(1, 3) (3,4)x y x y
m=
b=
Formal Definition of a Function A function relates each element of a set with exactly one element of another set(possibly the same set).
X Does Not Repeat
x y1 22 43 64 8
x y1 22 42 64 8
Domain = X Range=Y
http://kutasoftware.com/FreeWorksheets/Alg1Worksheets/Slope%20From%20a%20Graph.pdf
Find slope of line passing through given points.
(-4,1) and (3,4)
Steps 1.Plot points2.Count rise over run
M= Rise Run
http://kutasoftware.com/FreeWorksheets/Alg1Worksheets/Slope%20From%20an%20Equation.pdf
Finding slope from an equation
Finding Slope from an Equation
y = − 5 /2 x − 5 y = −4x − 1
2x − y = 1 −2y − 10 + 2x = 0
Steps1. Put equation in proper Y= MX +B form 2. Identify slope
B = Y intercept or Starting Point
M = Slope
Finding Slope without using a Graph
Y2 - Y1______
X2 - X1
M =
X,Y X,Y( 2 ,3 ) ( 4, 4)
Steps1. Substitute Coordinates into slope formula.2. Solve for M. (slope)
X,Y X,Y( -2 ,3 ) (4, -4)
X,Y X,Y(-27,36) (14, -47)
http://kutasoftware.com/FreeWorksheets/Alg1Worksheets/Slope%20From%20Two%20Points.pdf
Determine if the given point is on the given line:
Y= 2X + 2 (1,4) X Y
Steps1. Put equation in Y=mx+b form2. Graph on coordinate plane3. Check points
or 1. Plug equation into calculator2. Check points on table
Or
1. Substitute Values of X and Y into equation2. Simplitfy Equation3. Are both sides equal?
Determine if the given point is on the given line:
x = -4Y + 9 (1,2) X Y
Steps1. Put equation in Y=mx+b form2. Graph on coordinate plane3. Check points
or
1. Plug equation into calculator2. Check points on table