Question

Find two numbers with a sum of 20 and a difference of 14

Answer 1

17 and 3.

Answer 2

Write a rule for the linear function in the table.

x
f(x)
–3
–1
0
2
3
5
6
8

Answer 3

what is the linear function?

Answer 4

if you want to do it out...set up the 2 equations

x + y = 20
x - y = 14

solve for y in the first one

y = 20 - x

plug this into the second equation wherever you see a "y"

x - (20-x) = 14
distribute that "-" sign
x - 20 + x = 14
add 20 to both sides
x + x = 34
2x = 34
x = 17

go back and plug that into your first equation to find y

17 + y = 20
y = 3

Answer 5

^ i didnt even think about that @johnweldon1993 , i just was going through it in my head.

Answer 6

A. f(x) = x + 2

B. f(x) = 3x

C. f(x) = x – 2

D. f(x) = x – 1

Answer 7

x f(x)
-3 -1
0 2
3 5
6 8

i believe this is what he has for the linear function part

Answer 8

plug in each option.

Answer 9

@Hope_nicole yeah i know me too..but i wanted to do it out...so he could see how to solve any other problem like that

Answer 10

for example, on the first one...
f(x)=x+2
plug in the first value of -3
f(x)=-3+2
f(x)=-1...
therefore the first set it right, and keep going until you find an equation that satisfies all the points.

Answer 11

well lets see...
when

x = -3....it adds what to get 1? 2
x = 0 ...it adds what to get 2? 2
x = 3...it adds what to get 5? 2
etc...

so it looks like it adds 2 to whatever x is going to be....so that is?

Answer 12

so it's b

Answer 13

no check again @jumpman97

Answer 14

The scatter plot shows the number of students per class at Monida Middle School and the number of magazine subscriptions each class sold for a fund-raiser. About how many subscriptions did the class of 30 students sel

Answer 15

scattered plot please

Answer 16

A. about 185 subscriptions

B. about 175 subscriptions

C. about 165 subscriptions

D. about 195 subscriptions

Answer 17

1
–7
2
–10
3
–13
4
–16

Answer 18

what are the equations?

Answer 19

you cant figure it out @Hope_nicole ;P

x goes up by 1....y goes down by -3

it's a fancy slope equation

(y2-y1)/(x2-x1)

2 random points

(-16 + 13)/(4-3)

-3/1

so

-3x

when x = 0..y = -4 right?

so

y = -3x - 4

Answer 20

lol, no i was to busy writing a book! besides i was never good at those, i could figure out the pattern(the up one down -3) but could never put it in an equation. @johnweldon1993

Answer 21

@Hope_nicole just messing with you anyways :) well now you know how :)

Answer 22

yeah i know i know :) and yeah i wont remember that :P

Answer 23

The equation a = 640s gives the relationship between s square miles and a acres. Pam owns 7.5 square miles of farmland. How many acres does she own

Answer 24

well if a...is 640 times how many square miles she owns...just plug that in
a = 640(7.5)
what do you get?

Answer 25

A. 480 acres

B. 11.72 acres

C. 4,800 acres

D. 1.17 acres

Answer 26

well heres a hint....640 is bigger than every number in that answer key except?

Answer 27

4,800

Answer 28

exactly

Answer 29

so it's c

Answer 30

correct

Answer 31

The temperature on a particular day started at –13°F. It rose steadily by 3° each hour. The function y = –13 + 3x models the temperature, where x is the number of hours and y is the temperature. Graph the equation

Answer 32

use slope intercept form, so basically flip flop the -13 and 3x to have
y=3x-13
m is the slope, which in this case is 3
b is the y interept, which in this case is what?

Answer 33

well this is the slope intercept form

y = mx + b
m represents the slope of the line
b represents the y-intercept the the line...that should be enough to graph your line

Answer 34

Write a rule for the linear function in the table.

x
f(x)
1
3
2
2
3
1
4
0

A. f(x) = 4x

B. f(x) = x – 4

C. f(x) = x + 4

D. f(x) = 4 – x

Answer 35

again, try plugging in the data from the table into each equation till one satisfies all the points