anonymous
  • anonymous
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
Mathematics
  • Stacey Warren - Expert brainly.com
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chestercat
  • chestercat
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anonymous
  • anonymous
isn't it hard
Compassionate
  • Compassionate
What exactly are you having trouble understanding?
anonymous
  • anonymous
I don't get how you find the answer\

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Compassionate
  • Compassionate
Plug in the number 22mil
anonymous
  • anonymous
where in the Y?
Compassionate
  • Compassionate
@Luigi0210 explain this. I'm busy.
anonymous
  • anonymous
22MIL=0.3X+15like that
Compassionate
  • Compassionate
No.
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anonymous
  • anonymous
than where should I put the 22mil?
Compassionate
  • Compassionate
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.
anonymous
  • anonymous
so Y=.3 times 2011+ 13
Compassionate
  • Compassionate
Mhm
Compassionate
  • Compassionate
+ 15
anonymous
  • anonymous
ya 15
Compassionate
  • Compassionate
So you just keep plugging in dates until you reach 22mil. It's trial and error.
anonymous
  • anonymous
on 2011 I got 618.3
Compassionate
  • Compassionate
So plug in 2066 or another number until you get 22mil
Compassionate
  • Compassionate
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
Compassionate
  • Compassionate
I think this is too complex and you're not getting it. I'll just do it for you.
Compassionate
  • Compassionate
22 = 0.3X+15 0.3X = 7 X = 23.3 year = 1981+23 = 2004 Happy?
Compassionate
  • Compassionate
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.
anonymous
  • anonymous
omg thanks so much love realy helped
anonymous
  • anonymous
@Compassionate

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