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Linear equation involving fractions?
I worked out this problem on an online program called MyMathLab for class, and I've used up all my attempts to get the answer right. It kept showing up as wrong. Can someone tell me where I went wrong in solving this equation so I don't mess up next time I have a question like this?
How I worked the equation step-by-step:
Okay, so how does it turn out as 7x - 21? I'm confused...
4 Antworten
- icemanLv 7vor 9 JahrenBeste Antwort
2x + 2 = 42 - 7x - 21
9x = 19
x = 19/9
Edit: the LCD(lowest common denominator) is 14, multiply each term by 14
14(x + 1)/7 = 14 * 3 - 14(x + 3)/2
2x + 2 = 42 - 7(x + 3) => -7*x + -7 *3 = -7x -21
- ComoLv 7vor 9 Jahren
(x + 1) / 7 = 3 - (x + 3) / 2
2 (x + 1) = 42 - 7 (x + 3)
2x + 2 = 21 - 7x
9x = 19
x = 19/9
- Anonymvor 9 Jahren
Did you try this.
(x+1)/7 = 3 - (x+3)/2
(14/1)[(x+1)/(7)] = (14/1)(3 - [(x+3)/(2)]
2x+2 = 42 + (-7x - 21)
2x+2 = 21 - 7x
9x = 19
x = 19/9
- Anonymvor 9 Jahren
in 4th step it will be -21 in place of +21