Question

Which equation could you use to solve for x in the proportion StartFraction 4 over 5 EndFraction = StartFraction 9 over x EndFraction?

Answer 1

(b) 4 x = 4 5 is the needed expression to solve for the value of x.

Explanation:

Here, the given proportion is simplified as:

4/5=9/x

Now, to simplify any proportion of the form the simplest way is cross multiplication.

So, cross multiplying a/b=c/d -> ad=bc

Similarly cross multiplying 4/5=9/x, we get:

4 (x) = (9) (5)

Answer 2

x = 9x5 / 4

x = 45/4

(either one)

Explanation:

`(4)/(5)` =
`(9)/(x)`

Multiple known diagonals and divide by number opposite to unknown number (x).

Hope that helped!!! k