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goblinko [34]
3 years ago
11

What is the steps to this problem 5X-X=28

Mathematics
2 answers:
Naya [18.7K]3 years ago
4 0

You must first combine like terms. Like terms means the numbers with the same variables must be combined. In this case those two numbers are 5x and -x, since they both have the variable x attached.

You can combine these variables two different ways. Both will get you the same answer.

Method 1:

5x + (-x) ---> 4x

^^^Keep in mind that -x means the same thing as -1x. The one is just invisible.

Another way to write this is:

5x + (-1x) ---> 4x

Method 2:

5x - 1x ---> 4x

Now that you combined like terms you have the new equation:

4x = 28

Now you must divide 4 to both sides to isolate x. Since 4 is being multiplied by x, division (the opposite of multiplication) will cancel 4 out (in this case it will make 4 one) from the left side and bring it over to the right side.

4x ÷ 4 = 28 ÷ 4

x = 7

Check:

5(7) - 7 = 28

35 - 7 = 28

28 = 28

Hope this helped!

~Just a girl in love with Shawn Mendes

krok68 [10]3 years ago
4 0

Step-by-step explanation:

5x-x=28\qquad (x=1x)\\\\5x-1x=28\qquad\text{combine like terms}\\\\(5-1)x=28\\\\4x=28\qquad\text{divide both sides by 4}\\\\\dfrac{4x}{4}=\dfrac{28}{4}\\\\x=7

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serg [7]

Answer:

Total floor: 150 sq ft = $450

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Total cost $510

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2(H * W) = 2(8*10) = 160

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Total sq ft painted = 550 sq ft

550 sq ft / 275 sq ft (covered per paint) = 2 paints = $60

$450 floor + $60 paint = $ 510

3 0
2 years ago
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34 × 1.22 - 0.89
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3 years ago
If you eat a diet with 2,000 kilocalories and 45 percent of those calories come from protein, about how many grams of protein di
jekas [21]

The amount of Protein intake is 900 kilocalorie.

We have - 2000 Kilocalories of diet and 45 Percent of calories come from Proteins.

Wе have to find out the amount of protein intake.

<h3>If ' x ' students out of total ' n ' students in a class are infected by virus. Then, what percentage of students are infected.</h3>

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In the question given -

Let the amount of Protein intake be y.

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1 year ago
A rectangular area of 36 f t2 is to be fenced off. Three sides will use fencing costing $1 per foot and the remaining side will
OLga [1]

Answer:

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Perimeter of rectangle:

P  =  2x   +   2y    for convinience we will write it as    P  = ( 2x + y ) + y

C(x,y)   =  1 * ( 2x  +  y  )  +  3* y

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C(x)  =  2x  + 36/x   + 108/x

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How can we be sure that value will give us a minimun

We get second derivative

C´(x)  = 2  - 144/x²      ⇒C´´(x)  = 2x (144)/ x⁴

so C´´(x) > 0

condition for a minimum

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