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1
Steps for Finding Slope
1) Choose two points from the table or graph.2) Label one point A and one point B3) Draw a line from point A to the xaxis. Record the number XA.4) Draw a line from point B to the x axis. Record the number XB.5) Find the value of XB XA6) Draw a line from point A to the yaxis. Record the number YA.7) Draw a line from point B to the y axis. Record the number YB.8) Find the value of YB YA9) Find
slope = change in Y change in X
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What does the slope of a line mean?
slope = Change in dependant variable Change in independant variable
= Change in y Change in x
= y2 y1 x2 x1
= Δ y Δ x
Δ is a symbol that means "change in"
How much "y" changes for when "x" changes.
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(5,30)
(15, 90)
Hours
Pay
155
30
90
Emma gets paid $6.00 for every hour she works. Graph her pay. Find the equation for this graph.
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Example 2Emma gets paid a shift bonus of $30.00 plus she get paid $6.00 for every hour she works. Graph her pay. Find the equation for the line.
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(5,30)
(15, 90)
Hours
Pay
155
30
90
Emma gets paid a shift bonus of $30.00 plus she get paid $6.00 for every hour she works. Make a chart of her total pay. Graph her pay.
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8
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From graph to formula
independent variable
slope
Dependent Variable
P = 6 hours + 30
constant
independent variable
slope
Dependent Variable
y = mx + b
constant
Standard form
10
Assignment
p 283 17
Answers on page 467