math exam

the sum of twice a number and 9 is -25

the sum of twice a number and 9 is -25

2x +9 =25

10 less than the quotient of a number and 3 is 8

x/3 - 10 = 8

solve this equation: -45 = -4x - 11

x=14

2/5 a - 9 + -17

a = -20

6 - 4(3p-2)= 6(1-2p) - 1

no solution

-9 (n +4) = -5n - (4n +36)

infinite solution

P = 21+ 2w

p-21

------

2

for domain and range, graphing, is it rise/ run or run/rise

run/rise

(8, 2) (4,-1) (0,-1) (-4, 2) what’s the domain? what’s the range? function?

range = {-1,2} domain: {-4, 0, 4, 8}

is domain X or Y

X

Is range X or Y

Y

is range left to right or up and down

up and down

is domain left to right or up and down

left to right

what does f(x) mean

you put whatever number is in the parenthesis in the x spots in your equation

solve f(8)= -2x + 7

f(8)=9

in a graph, if the coordinate pairs is horizontal is has what slope and crosses what axis

the slope is 0 and crosses the Y-axis

in a graph, if the line is vertical, what slope and axis do it cross?

the slope is undefined and it crosses the x axis

if you have a graph with 2 points use:

rise over run to find the slope

identify the slope and y intercept of the equation

2x + 2y = -10

y= -x -5

what is slope intercept for,

y = mx + b

what makes it a function

you can’t have the same Y number, the idea of every x has one y

how do you right standard form

Ax + By = C

find the range of the function f(x)= x^2 -6x if the domain is {-7 , -2 , 1}

{91, 16, -5}

describe the slope of parallel lines

equal

describe the slopes of perpendicular lines

opposite reciprocals

what is the vertical line test

there can not be more than one point in a vertical line for it to be a function