First, a Word From Your Producers Jon and Tanner
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Transcript of First, a Word From Your Producers Jon and Tanner
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First, a Word From Your Producers Jon and Tanner
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First, a Word From Your Producers Jon and Tanner
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Tanner and Jon are coaches for a basketball and a soccer team. There
are 7 kids on the basketball team and 11 kids on the soccer team. They have $1000 to spend on at
least 11 soccer balls and 7 basketballs. Each Ultra-basketball costs $50. Each Ultra-soccer ball
costs $30. We need to buy as many balls as we can with our money.
By Tanner and Jon
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Substitution
x+y>25 (equation 1)-x -xy>25-x50x+30(25-x)<1000 (equation 2)
In this section, we converted the first equation into slope-intercept form and substituted it into the second equation for y.
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Substitution
50x+30(25-x)<1000 (equation 2)50x+750-30x<100020x+750<1000-750 -75020x< 250
Here, we distributed and combined like terms.
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Substitution
20x< 25020 20x < 12.5
In this part of the process, we just divided to find out what just a single x equaled.
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Substitution (cont’d)12.5+y>25-12.5 -12.5y>12.5
We rounded x down to 12 and y up to 13 because there are more people on the soccer team and you can’t buy half of a basketball or soccer ball, even if they are Ultra-basketballs and Ultra-Soccer balls
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TableX Y Money (Yes
or No)Meet
requirement?
5 11 580 (Y) N
7 11 680 (Y) Yes
7 12 710 (Y) Yes
7 13 740 (Y) Yes
7 14 770 (Y) Yes
7 15 800 (Y) Yes
7 16 830 (Y) Yes
7 17 860 (Y) Yes
7 18 890 (Y) Yes
7 19 920 (Y) Yes
7 20 950 (Y) Yes
7 21 980 (Y) Yes
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Table (cont’d)X Y Money (Y or N) Meet
Requirements?
7 22 1010 (N) Yes
8 19 1030 (N) Yes
9 12 1050 (N) Yes
10 12 1070 (N) Yes
7 12 710 (Y) Yes
8 12 760 (Y) Yes
9 12 810 (Y) Yes
10 12 860 (Y) Yes
11 12 910 (Y) Yes
12 12 960 (Y) Yes
13 12 1010 (N) Yes
12* 13* 990 (Y)* Yes*
The rows in bold are the ones where the cross of the lines would be, and the best one is x=12 and y=13, which is just under the budget, but higher than any of the others within the budget, and meets all requirements.
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Graph
0 5 10 15 20 25 300
5
10
15
20
25
30
0
25
12
25
0
13
First Equation (Crossing point)
Soccer ballsBasketballs
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Elimination50x+30y=1000-50(x+y)=(25)-50-50x-50y=-1250
Here we multiplied both sides of the equation by -50 so that it will cancel out the x variable when we add the equations together
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Elimination-50x-50y=-125050x+30y=1000-20y=-250
Here, we added the equations together to get an easier equation.
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Elimination-20y=-250-20 -20y=12.5
In this part, we divided each side by -20 to get a singular y variable.
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Eliminationx+12.5=25 -12.5 -12.5x=12.5
Now we just substituted the 12.5 in for y and found the value of x.
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Thank You!!From Jon and Tanner