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zhannawk [14.2K]
2 years ago
9

Easy question! First one to answer gets brainliest! 2x + 5 = 21

Mathematics
2 answers:
tangare [24]2 years ago
6 0

2x + 5 = 21

Subtract both sides 5

2x + 5 - 5 = 21 - 5

2x = 16

Divide both sides by 2

\frac{2x}{2}  =  \frac{16}{2}  \\

x = 8

madam [21]2 years ago
4 0

Answer:

8

Step-by-step explanation:

To determine the value of "x", we need to isolate the "x" variable completely. The first step in isolating the variable is to remove the constant on the L.H.S. This can be done by subtracting 5 both sides.

⇒ 2x + 5 = 21

⇒ 2x + 5 - 5 = 21 - 5

⇒ 2x = 16

The last step in isolating the "x" variable is to isolate the cooeficient of x. This can be done by dividing the cooeficient of x both sides.

⇒ 2x = 16

[Cooeficient of x is 2]

⇒ \frac{2x}{2}  = \frac{16}{2}

⇒ x  = \frac{16}{2} = 8

In conclusion, the value of the "x" variable is 8.

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Natalka [10]
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3 0
3 years ago
At the same store, Peter bought 2 pairs of pants and 5 shirts for $61, and Jessica bought 3 pairs of pants and 4 shirts for $67.
svetlana [45]

Hey there!!

Given :

The total cost for 2 pairs of pants and 5 shirts is $61.

The total cost for 3 pairs of paints and 4 shirts is $67.

<em>Let's take the cost for each pair of paints as 'p' and the cost for each shirt as 's'. </em>

Now, let's get these into an equation.

<em>Peter's equation</em> :

... 2p + 5s = 61

<em>Jessica's equation : </em>

...3p + 4s = 67

......................................................................................................

2p + 5s = 61 --- (1)

3p + 4s = 67 --- (2)

Multiply the first equation with 3 and the second equation with 2.

6p + 15s = 183

6p + 8s = 134

S<em>ubtract both the equations - </em>

... 7s = 49

Divide both sides with 7.

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<u><em>Hence, the cost of each shirt is $7. </em></u>

Hope my answer helps!!


6 0
3 years ago
How do you graph a linear equation?<br><br>For example, -18x+9y=72
nikdorinn [45]
Basically with the example you have you need to have the x and y variables on different sides. 
Equation: 
-18x+9y=72    (now you want to add 18x on both sides)
<u>+18x          +18x
</u><u>9y=72+18x </u>   (next you divide 9 to both sides to get x and y alone) 
      9 
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On the graph you want to put a dot on 8 since it's the y-intercept or the starting point of the equation. After that you want to add 2 every time you go by 1 on the x-axis. I have a picture of a graph...

<em>I hope this help you out :D</em>




4 0
3 years ago
Read 2 more answers
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Anastasy [175]

Answer:

A and C

Step-by-step explanation:

This would be the correct answers because they are congruent and dilated from each other

3 0
3 years ago
Multiply what is the product (3x10^9)x2x10^17) in scientific notation
tester [92]
Yes, it is 6x10^26 but how so?
multiply 3 x 6 to get 6
Then add the exponents of 9 + 17 = 26
Result = 6x10^26
8 0
3 years ago
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