Algebra 1
posted by Monica
Two fewer than a number doubled is the same as the number decreased by 38. Find the number.
If n is "the number," which equation could be used to solve for the number?

Steve
"Two fewer than a number" doubled
2(n2) = n38
Two fewer than "a number doubled"
2n2 = n38 
Monica
Thank Yu. Unknowns seem to get me stuck. I have another one.
Separate 846 into 3 parts so that the second part is twice the first part and the third part is triple the second part.
Which of the following equations could be used to solve the problem? 
Steve
call the parts a,b,c
a+b+c = 846
b = 2a
c = 3b
substitute in for b and c to get
a+2a+3(2a)=846
a+2a+6a = 846
9a = 846
a = 94
so, b=188
c=564
check:
94+188+564=846
To solve this kinda stuff, just take it one step at a a time. First, translate the words into symbols. Then substitute things as needed. After a thousand or so, you'll get the hang of it. :) 
Monica
Thanks :)
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