Solving Equations
Functions
Lines
Systems
Statistics
Potpourri
100
Solve: 2x + 2 = 18
x = 8
100
Is this a function: {(1, 2), (2, 3), (2, 4)}
No (2 as input cannot yield 3 and 4 as output)
100
What is the slope-intercept form of a linear equation?
y= mx + b
100
What are the three main techniques for solving systems of equations?
Substitution, elimination, and graphing
100
What's the difference between median and mean?
Median is the middle value of all numbers laid out in order, mean is the calculated average of all the values
100
What's the slope of p(x) = x?
1
200
Solve: 3x + 4 = 7
x = 1
200
Solve for y:
6x + 2y = 18
y = 9 - 3x
200
What is the standard form for linear equations?
Ax + By = C
200
Solve the system:
2y + x = 10
y = 4
(2, 4)
200
A total of 21 students were asked whether they like candy, and 19 of them said yes.
What percent of students polled like candy?
90%
200
Name a point that is a solution to the equation
y = 2x - 1
(0, -1), (1, 1), (2, 3), (3, 5), etc
300
Solve: 3x + 3 - 2x = 21
x = 18
300
g(x) = 12 + 3x
What's g(2)?
18
300
What is the y-intercept of
9x - 4y = -20?
(0, 5)
300
When looking at a graph of two lines representing a system of equations, where can you find the solution?
Where the two lines intersect (overlap)
300
Find the 5-number summary of this data set:
1, 1, 2, 3, 5, 6, 6, 8, 12
Min: 1
Q1: 1.5
Median: 5
Q3: 7
Max: 12
300
Which r value represents a stronger correlation?
-0.6 or 0.6
They have the same correlation! One's just positive and one's negative
400
Solve: 4x - 5 - 3x + 2 - 2x = 9
x = -12
400
p(x) = x + 9
Solve for x when p(x) = -1
-10
400
Given an equation in standard for (Ax + By = C), what is the value of the slope?
-A/B
400
Solve the system:
3y + x = 9
2y - x = 1
(3, 2)
400
What percent of people who prefer electronic books are adults? Round to the nearest tenth of a percent.
41.9%
400
When's your final?
7th period on 12/18!
500
Solve: 21 + x = 2(x - 6)
x = 33
500
The function G(t) describes a student's grade on the final as a function of their hours of sleep the night before.
What does G(8) = 95 mean, in the context of the problem?
A student who sleeps 8 hours before the final gets a 95 on the test.
500
A function defining the price of a ski lift ticket is:
P = 25 + 5x, where P is the price, and x is the number of lifts taken.
What is the y-intercept, and what does it represent in the context of the problem?
(0, 25), represents the buy-in price of the lift ticket, or the cost of taking 0 lifts
500
Solve the system:
y = x + 3
2y + x = 18
(4, 7)
500
Describe the association given by an r value of -0.8 as positive or negative, and weak or strong
strong, negative
500
A phone costs $500, and a computer costs $800. Come up with an equation that represents T, the total amount of money spent purchasing p phones and c computers.
T = 500p + 800c