Vocabulary
Lesson 4.2
Graphs
Linear Equations
Random Review
100
How can you tell when an association is strong or weak?
If the plotted points are closer to the trend line it is strong, when they are farther away it is weak.
100
What would a weak positive association look like?
A positive trend line, with plots off and not close to the trend line.
100
Point B
100
-9(x+6)=-207
x=17
100
In a survey, 7 out of 8 people preferred cooking to washing dishes. How would you write this ratio as apercent?
87.5%
200
What is a trend line?
The line of best fit, a line in the middle of the plotted points to determine if it is a strong or weak association.
200
Positive or Negative Association? Treadmill running time and calories burned
Positive linear association
200
Two names that are used to describe m in y=mx+b
Slope, Rate of Change
200
4(9x+6)=36x-7
No Solution
200
$22.50
300
What is a linear association?
Points that cluster into a straight line in the coordinate plane
300
Weak negative linear association
300
Two names that are used to describe b in y=mx+b
y intercept, initial value
300
0.35(x+4)=0.25(x-6)
x=-29
300
The function stays constant, and then it decreases sharply
400
What is a no association
Points that are spread out without a pattern in the coordinate plane
400
Which line is the best model of the data?
Line p
400
What is the for y=mx+b called?
Slope intercept form
400
2(3x+8)=2x+16+4x
Infinitely Many Solutions
400
What is the slope of the line that passes through the points (-2, 2)and(13, -7)
m=-0.6
500
What is a nonlinear association
Points that cluster into a curved shape in the coordinate plane
500
How do you know if a scatter plot shows a nonlinear relationship?
The points in the scatter plot form a curve or circle.
500
(y_2-y_1)/(x_2-x_1)
What is the formula to find slope?
500
5x-3(x-3)=-6+6x-5
x=5
500
What is the equation of a line that passes through the points (-3, 4)and(2, 8)?
y=0.8x+6.4