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laiz [17]
3 years ago
12

If 2x +9= 23, then 3x =

Mathematics
2 answers:
miskamm [114]3 years ago
8 0

Answer:

21

Step-by-step explanation:

First you have to solve for x in the equation 2x + 9 = 23. Cancel 9 on both sides. You cancel 9 by subtracting 9 on the left side and on the right side:

23 - 9 = 14.

Now, you have 2x = 14. To isolate the variable, divide by 2 to cancel out 2.

14 / 2 = 7.

This will give you x = 7. Now that you know what x equals, you can substitute x in 3x. This would make it 3(7), or in other words 3 x 7.

3 x 7 = 21.

This means that 3x would be equal to 21. Hope it helps!

stira [4]3 years ago
5 0

Answer:

<h2>to solve typical question like this first u have to find (x)</h2>

2x + 9 = 23 \\ x  = \frac{23 - 9}{2 }  \\ x =  \frac{14}{2}  = 7

<h2>therefore x = 7 </h2><h3>then substitute the answer u got for (x) to the 3(x)</h3>

<h2>3x</h2><h2>3×7 = <u>21</u></h2>

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