3 years ago

Which of the following equations could you use to find the nth

Mathematics

1 answer:

Marta_Voda [28]3 years ago

8 0

Geometric: a(sub)n=a1r^n-1
arithmatic: a(sub)n=a1+(n-1)d

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Write an appropriate direct variation equation if y = 18 when x = 2

Sergeu [11.5K]

Answer:

$y=9x$

Step-by-step explanation:

we know that

A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form $k=\frac{y}{x}$ or $y=kx$

In this problem we have

y=18 when x=2

Find the value of the constant of proportionality k

$k=\frac{y}{x}$ ----> $k=\frac{18}{2}=9$

therefore

The equation is equal to

$y=9x$

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