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fiasKO [112]
3 years ago
7

What is-2x+6y=6 7x+8y=-6?

Mathematics
1 answer:
rodikova [14]3 years ago
3 0
We can solve this by substitution

-2x=6-6y

-2x/-2=(6-6y)/-2
x= -3+3y

7(-3+3y)+8y=-6
-21+21y+8y=-6
29y=15
y=15/29

-2x+6(15/29)=6
-2x+90/29=6
-2x=6-90/29
-2x= 174/29-90/29
-2x= 84/29
-2x(29)=(84/29)29
-54x=84
x= -84/54
x= -14/9

so x= -14/9
y= 15/29
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Answers:

What is the ratio?         120:2

What is the unit rate?   60:1

What is the rate?          60 jumping jacks per minute

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Further Explanation:

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Saying "60 jumping jacks in 1 minute" is the same as saying "60 jumping jacks per minute", which is similar to a car's speed of something like 60 miles per hour. The unit "X per Y" is the template for speed, where X is the number of items you get done and Y is the unit of time. In this case, X = 60 jumping jacks and Y = 1 minute.

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