Tutors Answer Your Questions about Linear-systems (FREE)
Question 81885: respected teacher,
i have a big problem.
we have not learned this yet in the class.
the question is: find four values of(x,y)which satisfy each of the following equations.
1)2x +y = 7
2)x - y = 3
3)x = -y
4)x = y
5)x + y = 11
6)y - 5 = x
i didnt understand whether we have to take every single equation in consideration or only one at a time.
i tried it by taking one in the consideration.
and for the first one got the answer:
2x +y = 7
y = 7-2x
so if we substitute x=3
then, y = 7-2*3
y = 7-6
y = 1
thus if x = 3,then y = 1
and likewise we can get other co-ordinates by substituting x
ps:and if this way is correct for solving this question,dont solve the other sums.just tell me it is correct
thanking you in anticipation,
your student.
Click here to see answer by scott8148(6628)   |
Question 82218: My daughter has been struggling with this algebra problem and I couldn't help help her. Please help! "Carlo needs to buy at least eight flowers and has $15 to spend. Roses cost $3 per stem and carnations cost $1 per stem. Make a graph at the right to show all possible combinations of roses and carnations that Carlo could buy." How would that be graphed.
Please and thank you!
Click here to see answer by Edwin McCravy(20056)  |
Question 82563: I am trying to help my cousin who is pretty much failing Algebra I learn how to do her math. I am usually an Algebra wizz. I took Algebra in high school and college. I got an A in college. Now for the life of me I can't remember how to do some of the problems. Please help. Thanks a bunch
Joedy Brown
Click here to see answer by funmath(2933) |
Question 82561: Some scientists believe there is a limit to how long humans can live.* One supporting argument is that during the last century, life expectancy from age 65 has increased more slowly than life expectancy from birth, so eventually these two will be equal, at which point, according to these scientists, life expectancy should increase no further. In 1900, life expectancy at birth was 46 yr, and life expectancy at age 65 was 76. In 2000, these figures had risen to 76.9 and 82.9, respectively. In both cases, the increase in life expectancy has been linear. Using these assumptions and the data given, find the maximum life expectancy for humans.
Click here to see answer by ankor@dixie-net.com(22740)  |
Question 79277: Hello. I'm trying to solve the following system, but I keep running into fractions rather than whole numbers. (1) If I get rid of the fractions on the first equation by multiplying it by 8, then again by 12... and (2) multiply the second equation by 10 to eliminate Y, I get X = 1644/38 or 4.2590.
On the other hand, if I try by susbstitution (Y=5x/12 - 252) from the second equation into the first one, I get X = 79.33.
(7/2)X + (5/4)Y = 4
(5/6)X - 2Y = 21
What am I doing wrong? Shouldn't I get a whole number for an answer? Please help. Thanks for your generosity.
Click here to see answer by stanbon(75887) |
Question 82709: A certain brand of razor blades comes in packages of 6, 12, and 24 blades, costing $2, $3, and $4 per package, respectively. A store sold 12 packages containing a total of 162 razor blades and took in $35 dollars. How many packages of each type were sold?
Click here to see answer by ankor@dixie-net.com(22740) |
Question 83553: I am asking someone to please help me with my last 2 problems for my final which has to be in before 12 midnight. I do not understand what to do with
either one of these problems. Thanking you in advance.
solve the following system of linear inequalities by graphing.
3x+4y<12
x+3y<6
y>0
give the coordinates of the point graphed.\
A)(-3,2)
B)(2,-3)
C)(3,-2)
D) (-2,3)
Click here to see answer by stanbon(75887) |
Question 83553: I am asking someone to please help me with my last 2 problems for my final which has to be in before 12 midnight. I do not understand what to do with
either one of these problems. Thanking you in advance.
solve the following system of linear inequalities by graphing.
3x+4y<12
x+3y<6
y>0
give the coordinates of the point graphed.\
A)(-3,2)
B)(2,-3)
C)(3,-2)
D) (-2,3)
Click here to see answer by Edwin McCravy(20056) |
Question 83635: The solutions of line m are (3, 3), (5, 5), (15, 15), (34, 34), (678, 678), and (1234, 1234).
The solutions of line n are (3, -3), (5, -5), (15, -15), (34, -34), (678, -678), and (1234, -1234).
Form the equations of both the lines.
What are the co-ordinates of the point of intersection of lines m and n?
Write the co-ordinates of the intersections of lines m and n with the x-axis.
Write the co-ordinates of the intersection of lines m and n with the y-axis.
Thank You
Click here to see answer by checkley75(3666) |
Question 83855: This seems pretty easy, but I'm a little confused with this question:
There is $3.50 in nickels and dimes, if there are already 50 coins; how many of each type of coin is there?
A coffee merchant has coffee beans that sell for $9 per pound and $12 per pound. The two types are mixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture?
Also if I could and explanation on how I would figure out how to decide how much of each bean should be used.
Thank you for any help that I can get.
Click here to see answer by jim_thompson5910(35256) |
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