wertyong9689
24.03.2020 •
Mathematics
Solve 7x+2y=8, -5x-2y=-12 by elimination/addition
Solved
Show answers
More tips
- L Leisure and Entertainment What to Bring on a Hike? Essential Items to Pack for a Safe and Enjoyable Adventure...
- S Style and Beauty How Are Eyelash Extensions Applied? All Your Questions Answered...
- F Family and Home Tender Care for Your Parquet: Is it Possible to Clean Parquet?...
- S Society and Politics Is It Fact or Fiction? Let s Talk About Anton Chekhov s Pseudonym...
- S Sport Playing Bowling: Rules and Advice for Novices...
- C Computers and Internet How to Properly Repartition a Hard Drive?...
- A Auto and Moto What Is the Cost of Customs Clearance for a Car in Russia?...
- L Leisure and Entertainment Should You Buy a Ceramic Knife?...
- C Computers and Internet How to easily and quickly disable Firebug in Gmail and Google Docs...
- G Goods and services How to sew a ribbon: Tips for beginners...
Answers on questions: Mathematics
- M Mathematics Need help with 2-word problems, tysm if you do...
- M Mathematics -3 3/4 + 1/2 on a number line...
- M Mathematics Felix wants to go to all 19 home games at a football club. For each game, a ticket costs £29 A season ticket costs £381 and gives entry to all 19 home games. In total, how much does...
- M Mathematics Order the following expressions by their values from least to greatest. C -5 0 5 c-(-b) b a+(-c)...
- M Mathematics Trisha \and her three sisters to decide to purchase their mom a Christmas gift. They decide that everyone will contribute an equal amount, up to $60 per person. Which inequality will...
- M Mathematics you have a bookshelf that hold 15 and a half pounds how many 1and a fourth pound books can the shelf hold...
- M Mathematics Triangle ABC is translated and then reflected to MAP triangle A”B”C” as shown. Which of the following postulates or theorems proves the triangles congruent? • AA Postulate • HL Postulate...
- M Mathematics If I get paid 10 dollars a hour, how much do I get paid in 8 minute....
- M Mathematics What is the area of the figure below?...
- M Mathematics Hey I have question but I m stuck on this problem , would you mind helping me...
Ответ:
(-2, 11) That is, x = -2 and y = 11
Step-by-step explanation: We have a pair of simultaneous equations and since none of the variables has a coefficient of 1, we shall solve by use of the elimination method. The equations are
7x + 2y = 8 ———(1)
-5x - 2y = -12 ——(2)
The coefficients of the y variable in both equations is 2 in either case. So straight away, we add both equations together. (This is because of the negative sign in one the coefficients of y).
Adding both equations results in;
(7x + -5x) +(2y + -2y) = (8 + -12)
2x = -4
Divide both sides of the equation by 2
x = -2
Having calculated x, we now substitute for the value of x into equation (1)
7x + 2y = 8
7(-2) + 2y = 8
-14 + 2y = 8
Add 14 to both sides of the equation
2y = 22
Divide both sides of the equation by 2
y = 11
Therefore, x = -2 and y = 11
Ответ:
27 over 50 is greater than 27%
Let's try to turn 27 over 50 to a decimal first. To get the decimal form you have to divide 27 and 50.
27 divided by 50 = 0.54
Now we have to multiply by 100 to get the percentage.
0.54 x 100 = 54
54 = 54%
Hope this helps!