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Home > Education > Homework Help > Math & Sciences   »   solve equation

 
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Old Feb 27, 2008, 04:31 PM
shanna08
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solve equation

X-7 = -2

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Old Feb 27, 2008, 04:40 PM   #2  
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x=5
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Old Feb 27, 2008, 08:17 PM   #3  
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You have to isolate your variable x. So you always need to isolate down to the term that contains the variable. So you need to get rid of anything else that is there. There's a -7 there. To get rid of it, you always need to do the opposite operation. Since that's a minus 7, you need to add 7 to get rid of it. You also must do the same thing to both sides of the equation or it won't be equal anymore. So you also have to add a 7 on the right side:

x - 7 + 7 = -2 + 7

Which gets you:

x = -2 + 7
x = 5

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hauser5 agrees: now that is a teacher!! There is a difference between giving an answer, and showing how to get the answer!!
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Old Feb 28, 2008, 08:01 PM   #4  
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Thank you for the kind words, hauser5!
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