2 Answers

ATony · Answer 1 · 2021-01-23T16:16:18+0000

Answer:

42

Explanation:

For the proportion ...

(2)/(7)=(12)/(x)

Form the "cross products" by multiplying both sides of the equation by 7x (the product of the denominators. This gives you ...

$7x\cdot(2)/(7)=7x\cdot(12)/(x)\\\\2\cdot x=7\cdot 12\qquad\text{each numerator $*$ the opposite denominator}\\\\2x=84$

After you have formed the "cross products", divide by the coefficient of x:

x = 84/2 = 42

The value of x is 42.

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