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The product of two numbers is 713. The first number is 9 more than the second number. Which equation can be used to find x, the greater number?
x(x − 9) = 713
x(x + 9) = 713
x2 − 9 = 713
x2 + 9 = 713

Answer :

pingwin09
Let x = first number and y = second number.
The first statement is expressed as
x*y = 713
The second statement is expressed as
x = y + 9
To find x, use the second equation in terms of y, that is y = x - 9. Then substituting it to the first equation yields
x*(x - 9) = 713
facundo3141592

The equation that we need to use to find the numbers is the first option:

x*(x - 9) = 713.

Which equation can be used to find x?

We have two numbers, let's call them x and y.

We know that the first number is 9 more than the second, then:

x = y + 9

Then we know that the product is 713, so we have:

x*y = 713

If we isolate y on the first equation, we get:

y = x - 9

Replacing that in the product we get:

(x - 9)*x = 713

So the equation that we need to use is the first option.

If you want to learn more about equations:

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