graph 2x-3y -8 graph -2x-5y>15
TRANSCRIPT
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SOLVE & GRAPH7442 yandy
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SOLVE & GRAPH
6 11 13 3 2 9( )x or x
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SOLVE & GRAPH
04162
18572 xorxx
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GRAPHING LINEAR INEQUALITIES Graph 2x-3y<9
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GRAPHING LINEAR INEQUALITIES Graph 3x+4y > -8
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GRAPHING LINEAR INEQUALITIES Graph -2x-5y>15
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SCATTERPLOTS & LINE OF BEST
FIT
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CREATE A SCATTERPLOT & FIND THE LINE OF BEST FIT.
Wt Cl (kg)
Total Lifted (kg)
46 140
50 127
54 165
59 167
64 192
70 185
76 198
83 200
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USING THE GRAPHING CALCULATOR:
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GRAPHING STEPS CONTINUED
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CORRELATION Used to describe the relationship
between the independent variable (x) and the dependent variable (y).
It’s on a scale from -1 to 1 with the endpoints representing a perfect linear relationship.
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TYPES OF CORRELATION
0
10
20
30
40
50
60
70
80
90
0 10 20 30 40 50
0
10
20
30
40
50
60
70
80
90
100
0 20 40 60 80
0
20
40
60
80
100
120
0 20 40 60 80 100
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This refers back to the problem about weight classes
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LET’S TRY ANOTHER ONE! USE IT TO PREDICT THE SODIUM FOR 40 G OF FAT.
Fat (g) Sodium
19 920
31 1500
34 1310
35 860
39 1180
39 940
43 1260
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PRACTICE PROBLEM
Age 18 20 20 22 24 25 25 26 28 30 30 31 32 33 35 45
#CDs 12 15 18 12 10 8 6 6 4 4 4 2 2 3 6 1
a. Find equation of the least-squares line.
b. Find and explain the correlation coefficient, r.
c. Predict the number of CD’s purchased by a person who is 27 years old.
d. Find the age of a person who purchased 15 CD’s in the previous year.