Question

please help, algebra!!!

in the u.s., the number Y (in millions) of bicycles sold with wheels sizes of 20in. or greater can be modeled by the equation of Y=0.3X+15 where X is the number of years since 1981. what year were about 22 million bicycles sold? explian

Answer 1

isn't it hard

Answer 2

What exactly are you having trouble understanding?

Answer 3

I don't get how you find the answer\

Answer 4

Plug in the number 22mil

Answer 5

where in the Y?

Answer 6

@Luigi0210 explain this. I'm busy.

Answer 7

22MIL=0.3X+15like that

Answer 8

No.

Answer 9

than where should I put the 22mil?

Answer 10

You need to do trial and error. We know that it's from 1981 and up. So put various dates, like 2011 or 1998, into the x position.

Answer 11

so Y=.3 times 2011+ 13

Answer 12

Mhm

Answer 13

+ 15

Answer 14

ya 15

Answer 15

So you just keep plugging in dates until you reach 22mil. It's trial and error.

Answer 16

on 2011 I got 618.3

Answer 17

So plug in 2066 or another number until you get 22mil

Answer 18

Y=0.3X+15

Imma plug in 5000

y = 0.3(5000) + 15
y = 1515

So plug in something else.

y = 0.3(250,000) + 15
y = 75015

Answer 19

I think this is too complex and you're not getting it. I'll just do it for you.

Answer 20

22 = 0.3X+15
0.3X = 7
X = 23.3
year = 1981+23 = 2004

Happy?

Answer 21

Since X is the number of years since 1981
we first disregard the fractional part of X and just add 23 to 1981 because if you are 1/3 through a certain year you are still in that year. Just like if I told you I was 18 even though my birthday was 6 months ago.
1981+23=2004.

Answer 22

omg thanks so much love realy helped

Answer 23

@Compassionate