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svet-max [94.6K]
3 years ago
10

Given that y and x are directly proportional and y=22 when x=6, find the value of y when x=15.

Mathematics
1 answer:
aev [14]3 years ago
6 0

Answer:

y = 55

Step-by-step explanation:

Hi,    

Remember: if y and x are directly proportional, you could write a ratio with those values, as follows:

y:x becomes 22:6

You can write an equation with the new value:  

y:15 = 22:6

Now solve by cross multiplication. Imagine that those ratios are fractions:

y/15 = 22/6

y*6=15*22

6y=330

y=55

The value of y is 55 when x is 15.

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Step-by-step explanation: In order to find the slope by these two points, (6,-4), and (-4,-4), you must use the slope formula:

rise/run, which is this case, is y2-y1 / x2 - x1 <--- this is the slope formula

Let 6 be x2, -4 be x1, y2 be -4, and y1 being -4, plug these numbers in.

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Step-by-step explanation:

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