Solve Equations
Solve for x; x/-12 = 24
x=-288
What is the slope and y-intercept of y=2x - 5
m = 2 and b = -5
4 - x > 12
x < -8
What is a domain?
All possible x-values of a relation
What is this the formula of: (y2 - y1) / (x2 - x1)
The slope of the line connecting (x1, y1) and (x2, y2)
x/3 - 5 = 22
x=81
Identify the slope and y-intercept of 2x + y = 6
m=-2, b=6
5 - 2x > 13
x < -4
State the Domain and Range of the following relation:
{(2, 4), (9, 0), (-3, -1), (1, 3)}
D: {-3, 1, 2, 9}
R: {-1, 0, 3, 4}
What form is this equation in: y - 7 = 3(x -2)
Point-Slope Form
2x - 5 = -3x- 40
x=9
Identify the slope and y-intercept of y - 3 = 4(x+1)
m=4, b=7
3(x+2) < 4(3-x)
x < 6/7
What is a range?
All possible y-values of a relation
Describe how to plot a point on a graph
Go left/right the x-value (first number), then go up/down the y-value (second number). Plot the point.
3(x-14) = 17x
x = -3
Identify the slope and y-intercept of A line that goes through (0,2) and (-4,0)
m=1/2; b=2
Rasheed makes a profit of $1.25 for each cell phone he sells. What is the smallest number of cell phones he can sell and earn over $1000?
Rasheed must sell at least 801 cell phones. (If he sells 800, he earns exactly $1000 which is not over $1000)
Is this relation a function:
{(1, 3), (1, 3), (2, 5), (4, 6), (5, 6)}
Yes, even though the x-value for 1 is repeated, the y is the same value (3).
Write as a function and solve
A student wants to buy pretzels for his class. He has 18 people in his class including himself and the pretzels cost $2 each. What is the total cost of the pretzels?
f(x) = 2x
f(18) = 2(18) = $36
Solve for x; 2x - 4(2 - x) = 2(15x - 3)
x = -1/12 or -0.0833
Identify the slope and y-intercept of a line that is parallel to y=-1/2x - 7 and goes through the point (2,5)
m = -1/2; b=6
-5x > -5x
No solution
What is the test to tell if a graph is a function?
Vertical Line Test.
What sport did Mr. Shene grow up playing before HS?
Baseball