![cameron12502](/avatars/26302.jpg)
cameron12502
10.06.2021 •
Mathematics
Please help solve this using L.C.M and explain the steps plz ty.
Solved
Show answers
More tips
- B Business and Finance How to Get Your Money Back When Lending? Top 7 Ways...
- S Sport How to Learn Swimming? Simple Tips for Beginners...
- P Photography and Videography Understanding HDR: How It Works and Why You Need It...
- G Goods and services Which TV is better - LCD or Plasma?...
- S Sport How to Learn to Pull Up on Monkey Bars?...
- L Leisure and Entertainment Scrapbooking: What is it and Why is it Becoming More Popular?...
- C Computers and Internet Where did torrents.ru move to?...
- B Business and Finance Understanding Cash Flow: What It Is and How It Works...
- C Computers and Internet What Are Peers and Seeds in Torrenting?...
- H Health and Medicine 10 Simple Techniques on How to Boost Your Mood...
Answers on questions: Mathematics
- M Mathematics The scientist in the laboratory company raise amoebas to sell to schools for use in biology classes. they know that one amoeba divides into two amoebas every hour and that formula...
- M Mathematics (b) Work out 5 1 6 12...
- M Mathematics I know, fairly simple question, but can i please have some help?...
- M Mathematics What is 2/3 divided by 4/5...
- M Mathematics Please answer ASAP I’ll mark brainliest...
- M Mathematics (6) Work out 5 1 6 12...
- M Mathematics Solve (x-3) (x+2) = 0 and x² - 25...
- M Mathematics A rectangle has a length 2 cm larger than its width. (a) If the perimeter of the rectangle is 14 cm, what are the dimensions of the reciangle? (b) If the area of the rectangle is 63...
- M Mathematics Which of the following is equivalent to |x-1| 5? X-1 5 5 x-1 5 -5 x-1 5 -5 x-1 5...
- M Mathematics The news reported that inflation will rise 2.5% this year. If you make the averagefamily income, how much would yourannual income have to increase to buy asmuch in one year as you...
Ответ:
9514 1404 393
(x, y) = (2, 3)
Step-by-step explanation:
The first step is to find the least common multiple of the denominators of each of the equations. If the denominators have no common factors, a reasonable choice is their product. Here, it works to start with the fractions that must be added, then compare the LCM found to the denominator on the right to see if any further factors must be included.
First equation:
LCM = 3×4 = 12
12(2x/3 -y/4) = 12(7/12) . . . . . multiply the equation by 12
8x -3y = 7 . . . . . . . . . simplify
Second equation:
LCM = 4×5 =20
20(3x/4 -2y/5) = 20(3/10) . . . . multiply equation by 20
15x -8y = 6 . . . . . . simplify
Solve by elimination
We can eliminate the y-variable by subtracting 3 times the second equation from 8 times the first:
8(8x -3y) -3(15x -8y) = 8(7) -3(6)
19x = 38 . . . . . simplify
x = 2 . . . . . . . divide by 19
Substituting into the first equation gives ...
8(2) -3y = 7
3y = 9 . . . . . . add 3y-7
y = 3 . . . . . divide by 3
The solution is ...
(x, y) = (2, 3)
_____
There are many ways to solve such a system of equations. Using the LCM to eliminate fractions is one way to start. You can also do the arithmetic with the fractions intact, though most folks don't care to. In addition to the elimination method used here, you can use matrix or graphical methods, substitution, or any of the variations of Cramer's Rule.
Ответ: