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stellarik [79]
3 years ago
13

1. 2x-3=5+2x 2. 7b-6(1-2b)=10. 3. 8z+12=5z-21

Mathematics
1 answer:
dexar [7]3 years ago
7 0
1. x is indefine

2. b= 16/19

3. z= -11

4. k= 23/20

5. x= 0
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Please help 18 points.!<br> I need to know what goes in the three boxes.
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One month Chris rented 2 movies and 12 video game for a total of $44. The next month he rented 5 movies and 3 video games for a
aleksley [76]
M= movie cost
v= video cost

Create two equations with the given information. Solve for one variable in equation one. Use that answer to substitute into equation two.

2m+12v=$44
5m+3v=$29

Solve for one variable in equation 1:
2m+12v=44
Subtract 12v from both sides
2m=44-12v
Divide both sides by 2
m=(44-12v)/2

Substitute m answer in equation two:
5m+3v=$29
5((44-12v)/2)+3v=29
(220-60v)/2+3v=29
Multiply everything by 2 to eliminate the fraction
(2)(220-60v)/2+(2)(3v)=(2)(29)
220-60v+6v=58
220-54v=58
Subtract both sides by 220
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Divide both sides by -54
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Substitute v value to find m value:
2m+12v=$44
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Subtract both sides by 36
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Divide both sides by 2
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Check:
5m+3v=$29
5(4.00)+3(3.00)=29
20.00+9.00=29
29=29

Hope this helps! Please mark me as brainliest if it does. :)
7 0
3 years ago
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