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Semmy [17]
3 years ago
13

Y is inversely proportional to x

Mathematics
2 answers:
irinina [24]3 years ago
8 0
A ) equation would be X = Z / Y
B ) if X = 9 ------------> Y = 1/7
X = 21 ----------> Y = ?
21*1/7 = 21/7 , 21/7÷9 = 21*9/7 = 27

so Y equal 27
iris [78.8K]3 years ago
3 0

Answer:

y=\frac{63}{x}

y=3

Step-by-step explanation:

y is inversely proportional to x

when y=7, x=9

When y is inversely proportional to x , then the equation is

y=\frac{k}{x}

where k is the constant of proportionality

y=7, x=9 plug in the values and find out k

7=\frac{k}{9}

Multiply 9 on both sides

63=k

an equation connecting y and x is y=\frac{k}{x}

y=\frac{63}{x}

b) work out the value of y when x=21

y=\frac{63}{x}

Plug in 21 for x

y=\frac{63}{21}

y=3

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