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kodGreya [7K]
3 years ago
13

The variables x and y vary directly. When x is 3, y is 6. Find x when y = 2/3

Mathematics
1 answer:
nasty-shy [4]3 years ago
7 0
X=3
y=6

y=2x
2/3=2x
(2/3)/2=x
(2/3)×(1/2)=x
2/6=x
x=1/3
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5x + 6y = 18 and 18x -15y =36
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5x=18-6y

x=(18-6y)/5

Use that in the other equation
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28.8=36.6y
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Now put that number in for y on the first equation

5x+6(.78) = 18
5x + 4.68 = 18
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