Question

Please help!!!!!!! I just want you check if these are correct or not



2. Find the equation of the line in the graph and mathematically model the scenario using function notation where cost is a function of number of minutes.

Answer 1

y = 20
x = 400


Changes in y over changes in x .

x = 20/400

simplify : 20/400 = 1/20

Answer 2

f(x) = 1/20 + 20

Answer 3

5. Create your own equation written in standard form: Ax + By = C

2x + 5y = 10


Determine any point that is a solution and will be on this line. Justify your answer algebraically.

3x + 5y = 15
3*0 + 5y = 15
5y/5 = 15/5

y = 3

x = 0 and the y = 3. So the solution is (0,3)

5y + 3x = 15
5*0 + 3x = 15
3x/3 = 15/3
x = 5

So the x intercept is 5 and y intercept is 3

Rewrite the equation using function notation. Graph the function and show the intercepts.

5y + 3x = 15
-3x -3x

5y = -3x + 15

5y/5 = (-3x +15)/ 5

y = -3/5x + 3

f(x) = -3/5x + 3

Answer 4

6. Compare the graph from question 2 and the equation from question 5. How are the graphs similar and different? Determine which has the greater y-value when x is 160 and explain how you determined it.

Similarities between this two equation is both of these are in function notation and different between them is both have different x intercepts and y intercepts.

f(x) = -3/5 x+3
f(160) = -3/5(160)+3
-93

f(160) = 1/20(160)+20
= 28

Answer 5

@zzr0ck3r @wolfe8

Answer 6

@amistre64

Answer 7

Looks right to me.

Answer 8

okay thanks so much for coming and check my problem :)

Answer 9

I am just making sure with everyone :)

Answer 10

which one is greater -93 0r 28

Answer 11

I am little confuse in this one because of -sign

Answer 12

@amistre64 what you do think about my problems way I solve? those are all correct or not.

Answer 13

which is taller, a 93 feet deep hole, or a 28 feet tall hill?

Answer 14

I believe 93

Answer 15

f(x) = 1/20 ___ + 20
^^^
missing the x from your equation, otherwise it looks good

Answer 16

okay, thanks so much guys for checking my work and giving me satification!!!!!!! :)

Answer 17

I meant satisfaction, lol. I typed wrong in excitement. thanks @wolfe8 @amistre64

Answer 18

so it is positive 28. right @amistre64 @wolfe8 ?

Answer 19

or -93

Answer 20

which is the greater ? I am little confuse this one. @amistre64 @wolfe8
Just want to be clear with this one

Answer 21

when i consider these, i let a negative be a hole in the ground, and positive be a hill or mountain .... 0 is ground level.

or i let it be a bank account .....

Answer 22

I first thought positive 28 because it is greater than negative

Answer 23

which is taller?

Answer 24

am I right?

Answer 25

yes, 28 is bigger than -93

Answer 26

thanks a lot both of you for coming here and giving your precious time to me :) thanks !!!!!!!!