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3 years ago

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

2 answers:

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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Fiesta28 [93]

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3 years ago

Total mass vs. numbers of cd and numbers of cd

Gekata [30.6K]

Answer: Choice A) M = 0.25n + 100

=============================================================

Explanation:

For now, I'll treat n as x, and M as y.

In other words,

x = number of CDs
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The slope of the line through those points is

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Now we'll use the point (x,y) = (200,150) along with that slope value to find the y intercept b

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You could also use (x,y) = (400,200) and you should get the same b value.

In fact, any other point from this graph works as well.

------------------------------

Since m = 0.25 and b = 100, we go from y = mx+b to y = 0.25x+100

This then translates over to M = 0.25n + 100 which is choice A

To help verify this, let's say we plugged in n = 100

M = 0.25*n + 100

M = 0.25*100 + 100

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Which is confirmed by what the graph shows. I'll let you check the other points as well.

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Learn more about algebraic expression in:

brainly.com/question/21856579

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