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Cheryl M. for tutoring lessons in Grosse Pointe MI Over 20 tutoring hours WyzAnt Tutoring Tutor Tutor United States

Cheryl M.

Seasoned and Passionate about Teaching

Grosse Pointe, MI (48236)

Travel Radius 10 miles
Hourly Fee $40.00
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  3 ratings

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Cheryl's Responses in WyzAnt Answers

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Algebra

when you subtract a variable from a whole number and a variable:example x+23=2x+45 why does the 2x become 0?

I need to understand the rules of basic algebra. I understand the answer, I need to understand why it is the answer. x+23=2x+45

      x-x+23=2x-x+45

        23=x+45. why does the 2x become just x ? why is the answer not just 2?

+ more- less
Asked by Kelvin from Macomb, MI
01

Cheryl's Answer:

Well..., the goal is to get the x's (variables) on one side and the numbers on the other.  So by subtracting 2x from both sides (we must always keep things equal and exact in mathematics- that is why you subtract from both sides of the equation) there are no more x's left on the one side.  So really the x's are not 0.

x + 23 = 2x + 45

-x + 23 = 45

-x = 22

x = -22

Division

why cant you divide by zero, wont it just be zero?

my teacher asked this but i dont know why you cant divide by zero

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Asked by Gady from Roy, UT
35

Cheryl's Answer:

You cannot divide by 0 because there is nothing to divide. Zero is nothing.  Think logically - if there are 12 pieces in a Hershey bar and you are divying it up between six kids, then each will have 2 pieces.  Thereby leaving nothing (0) left should another kid come and want some.

 

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