Question

help please

Answer 1

@Hero

Answer 2

do you have any idea to solve this ?

Answer 3

in case of every choices you can multiply both sides by 1000 and in this way will be eliminated the decimales

for example the first one after multiplie both sides by 1000 will get

1000y = 4x^2 +415x +546

and now you need substitute the x and y value in place of y and x and check that satisfie the equality

what roots value you think that may be more easy substituting in these places of x and y ?

Answer 4

i think 20 and 3 so what mean x=20 and y=3

and now just substitute the 20 in place of x and the 3 in place of y - check that will get if the right side will be equal with left side

Answer 5

1000y = 4x^2 +415x +546

1000*3 = 4*20^2 +415*20 +546

3000 = 4*400 + 8300 +546 you see that the left side not will be never equal with right side with these values

yes ?

Answer 6

this mean that the first one quadratic not is right

Answer 7

do you understand now the way ?

Answer 8

what?

Answer 9

so the first one is incorrect.

Answer 10

yes and in this above wrote way you need checking the other choices

Answer 11

@Vocaloid please what is your opinion about my idea here ?

Answer 12

meh

I don't really know how to do these by hand, your best bet is plugging the points into software and letting it determine the regression equation

Answer 13

princeevee we check now the 3th choice

multiplie both yides by 1000 and will get

1000y = -4x +415 and for x = 20 and y = 3 we get

1000*3 = -4*20 +415 without calcule you see that the left side not is equal with right side sure

yes ?

Answer 14

from this result that the 3rd quadratic not is right sure

ok. ?

Answer 15

so than you see the last one there is in the left side pozitiv y and on the right side this term in front with minus so from this result that in this case the right side not will be never equal with left side

ok. ?

Answer 16

so in this way we eliminated the first and the 3rd and 4th choices so remained the second to be right

do you can check it now this ?

Answer 17

i got it, but i can barely understand your english, i'm sorry.

Answer 18

multiplie both sides by 1000 and will get

1000y = -4x^2 +415x -546 and now try it with these values of x and y

Answer 19

@ThisGirlPretty please help me here

Answer 20

ok. where and what you dont understand please ?

Answer 21

1000y = -4x^2 +415x -546

x = 20
y = 3

1000*3 = -4*20^2 +415*20 -546

do you can continue it now ?

Answer 22

ok.

3000 = -4*400 + 8300 -546

3000 = -1600 +8300 -546

3000 = 8300 - 2146 so this not is right too

in this case sorry but i dont know any other ways @Vocaloid please just for one moment

Answer 23

@ThisGirlPretty please