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r-ruslan [8.4K]
3 years ago
9

Suppose y varies directly as x and y=21 when x=7. which is an equation relating x and y

Mathematics
1 answer:
astra-53 [7]3 years ago
8 0
Y varies directly as x: y=kx, k is a constant.
when x=7, y=21, so we know k=3
therefore, the equation is y=3x
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Ivenika [448]
For #6

x + y = -10
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First solve for y in one of the equations

x - y = 2
-y = 2 - x
y = -2 + x
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Now substitute into one of the equations and solve for x

x + y = -10
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3 0
3 years ago
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Answer:

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7 0
3 years ago
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pshichka [43]

Answer:

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6 0
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Allushta [10]

Answer:

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Step-by-step explanation:

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substitution

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