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Solving Equations
Inequalities
Linear Regression
Linear Equations
Absolute Value
100
x/4 = 9/12
x = 3
100
-2x > 8
x < -4
100
The correlation coefficient (r) must fall between what 2 numbers?
-1 and 1
100
What type of linear equation is always of the form y = kx
direct variation
100
|x| = 3
x = -3, x = 3
200
4x + 4(2x - 1) = 20
x = 2
200
2y + 9 < 5y + 15
y > -2
200
The type of regression line that we use is called the ________________ regression line.
Least Squared
200
Find the slope: (3, -1), (-2, -2)
m = 1/5
200
|b - 3| = 6
b = 9 and b = -3
300
3y/10 = (y - 1)/6
y = -5/4 or -1.25
300
2x + 3 > 1 and 5x - 9 < 6
x > -1 and x < 3
300
If r = -0.3, describe the correlation
weak, negative
300
Write an equation given the indicated points. Final answers should be in the slope-intercept form. (-2, 4) (3, 14)
y = 2x + 8
300
|a + 3| > 1
a > -2 or a < -4
400
2x=3(x-3)
x = 9
400
2x < 5 or 7x + 1 > 36
x < 2.5 or x > 5
400
If the regression line is y = 0.3x + 5.2, predict the value at 8
y = 7.6
400
Write an equation perpendicular to y = -1/2 x - 3 and goes through (2, -2) . Final answer should be in the slope-intercept form.
y = 2x - 6
400
|4c - 2| < 10
c < 3 and c > -2
500
Solve L x W x D = V for L
L = V/ (W x D)
500
2b - 3 > 1 and 3b + 7 < 1
b > 2 and b < -2 NO SOLUTION!
500
The Least Squared regression line minimized what?
deviation
500
Find the equation of the line that goes through the points (2, 2) and (2, 7)
x = 2
500
|x - 4| < -2
No Solution