Functions
f(x)= is the same as what?
y=
What is the slope-intercept equation for a line?
y=kx+b
What is the slope of a horizontal line?
0
The graph of a directly proportional relationship has what shape?
A straight line
Does the pair (2,3) satisfy the equation:
2x-y=4
No
Solve when x=3.
y=5x-2
y=13
What does the graph of a first degree function look like?
Is the graph of the following line increasing or decreasing?
y=3x-4
Increasing
What is the shape of an inversely proportional relationship?
A hyperbola
What is x when y=5?
3x-y=13
x=6
Solve for x.
19=8x+3
x=2
What is the slope of this line?
y=3/4x-12
3/4
What is the y-intercept of the line with the equation y=1/2x+5?
(0,5)
In terms of y, k, and x, how would you write the relationship representing direct proportionality? (an equation)
y=kx or y/x=k
Is the number pair (3,1) a solution to the pair of equations:
y=2x-5
y=3x-8
Yes
Solve for f(x) when x=5.
f(x)=3x2 -2x+2
f(x)=67
What is the slope of a vertical line?
undefined
What is the shape of a second degree function?
Parabola
Are the following quantities directly proportional? What is the constant of proportionality?
x: 1, 2, 3, 4
y: 2, 4, 6, 8
Yes; k=2
What is the x value when y=3 that satisfies the following pair of equations:
2x-3y=1
-3x+y=-12
x=5
Solve for x when f(x)=11.
f(x)=(8/x)+5
x=48
Find the slope of the line that passes through the point (2,4) and that has its y-intercept at (0,-1).
5/2 or 2 1/2
What is the equation of the line parallel to the line y=2x+4 that has its y-intercept at (0,-8)?
y=2x-8
Is the following relationship directly proportional, inversely proportional, or neither?
y=3/x
Inversely Proportional
Find a number pair that satisfies the following equation pair:
y=x
y=2x-1
(1,1)