3x+6=15 solve for x x= ?

Mathematics

2 answers:

poizon [28]3 years ago

6 0

x=3 is your answer.

To solve this equation we need to isolate the variable.

3x+6=15

So first subtract the number six from both sides. Now the equation should look like this.

3x=9

Then divide both sides by the number 3. So now the equation looks like this.

x=9/3

Simplify 9/3 to 3 and that is your answer.

x=3

mylen [45]3 years ago

5 0

Answer: x=3

Step-by-step explanation: Subtract 6 from both sides, Simplify

15−6 to 9, and then divide both sides by three.

3x=15−6

3x=9

x=9/3

x=3

Hope this helps, have a BLESSED day! ☺️

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The length of a rectangle is nine inches more than its width. Its area is 486 square inches. Find the width and length of the re

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Answer:

width: 18 in
length: 27 in

Step-by-step explanation:

The relations between length (L) and width (W) are ...

W +9 = L

LW = 486

Substituting gives ...

(W+9)W = 486

W^2 +9W -486 = 0 . . . put in standard form

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The width of the rectangle is 18 inches; the length is 27 inches.

_____

<em>Comment on factoring</em>

There are a number of ways to solve quadratics. Apart from using a graphing calculator, one of the easiest is factoring. Here, we're looking for factors of -486 that have a sum of 9.

486 = 2 × 3^5, so we might guess that the factors of interest are -2·3² = -18 and 3·3² = 27. These turn out to be correct: -18 +27 = 9; (-18)(27) = -486.