Ok this is a simple algebra problem, but for some reason I can't figure out what I am doing wrong. The problem is:
SOLVE (written in interval notation):
-5x+11/2 is less than or = 7.
The first step is to multiply each variable/number by 2; the common denominator of the two fractions (-5x+11/2 & 7/1). Hence, you would get -10x + 22 is less that or = 14. Then, you would subtract 22 from both sides therefore making -10x less than or = -8. Divide -8 by -10 and the solution therefore is [8/10 to infinity), or 4/5 to infinity if simplified. However, my stinking College Algebra book says the answer is [3/5 to infinity).
Step 1: -5x + 11/2 < or = 7
Step 2: (2)-5x + 2(11) < or = (2)7
Step 3: -10x + 22 < or = 14
- 22 -22
Step 4: -10x < or = -8
/-10 /-10 = 8/10 = 4/5!
HOW COULD IT BE 3/5?!? Any thoughts or advice? Thanks!
2006-11-11
03:34:18
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12 answers
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asked by
Anonymous
in
Mathematics