Question

For which equation does the point (20,60) lie on the graph ? Explain
i. C=15+2.50n ii. C=50+1.75n iii. C=30+1.50n

Answer 1

i dont understand how to do it

Answer 2

@minotti Hi,

\(\huge \color{red}{\text{Welcome to Open Study}}\ddot\smile\)

the point (20,60) lie on the graph means it satisfies the equation of the graph.
So, you have to plug in the point (n,C) = (20,60) in all the choices and check which one equation gets satisfied by this point.

Answer 3

can you show me how to figure it out.

Answer 4

ok, i will plug in that point in the first equation/choice and see whether the point satisfies the equation of the graph.
i. C=15+2.5n
(n,C)=(20,60)
put n=20
C = 15 + 2.5*20 = 15 +50 = 65
but C needed to be 60 , so C=15+2.5n is not the equation of required graph.
You check for ii. and iii.

Answer 5

ok hold on trying to fiqure it out

Answer 6

c=50+1.75n
(n,c)=(20,60)
n=20
c=50+1.75 20=50+75=125

Answer 7

1.75*20 =... ?

Answer 8

do i mupliy it

Answer 9

yes.

Answer 10

ok
1.75*20=3.500

Answer 11

1.75*20 = 35

c=50+1.75n
(n,c)=(20,60)
n=20
c=50+1.75 20=50+35=85
but C needed to be 60 , so C=50+1.75n is not the equation of required graph.
now check iii.

Answer 12

c=30+1.50n
(n,c)=(20,60)
n=20
c=30=1.50 20=30+30=60

Answer 13

yes ! so we got C=60 as required.
so, the graph is C=30+1.50n

Answer 14

yes i understand it thank you for helping me

Answer 15

welcome ^_^