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Ket [755]
3 years ago
5

Find y when x=9 if y varies directly as x, and y=245 when x=7

Mathematics
1 answer:
Aleonysh [2.5K]3 years ago
8 0
Since y varies directly as x, you know that y=245 and x=7 can be used as a proportion, 245/7.  When you multiply this proportion to 9, you get 315.  This is the value of y when x=9.  

y=315
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Answer:

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salantis [7]
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4 0
3 years ago
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natka813 [3]
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3 0
3 years ago
Through (2, -1), perp. to y = -2x-3
kramer

9514 1404 393

Answer:

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Step-by-step explanation:

The given equation is in slope-intercept form, so you recognize its slope is -2. The perpendicular line will have a slope that is the opposite reciprocal of that, so is -1/-2 = 1/2.

The y-intercept can be found from ...

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Then the slope-intercept equation of the perpendicular line is ...

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6 0
3 years ago
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