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The variables y and x have a proportional relationship, and y = 7 when x = 2.

What is the value of x when y = 21?

Respuesta :

Answer:


Step-by-step explanation:

The Ratio of y : x equals to 7 : 2. Multyplying both number by three, y equals 21 and x equals 6

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Answer:

x=6

Step-by-step explanation:

We can use ratios to solve this.  The ratio has to stay constant if they are proportional.  Put y in the numerator and x in the denominator.

         7         21

        ----- = ----

        2          x

We can solve using cross products.

7*x =2 *21

7x = 42

Divide each side by 7

7x/7 = 42/7

x =6

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