Tutors Answer Your Questions about Linear-systems (FREE)
Question 24526: I am having trouble with this problem.
SOLVE THIS SYSTEM OF EQUATIONS, WHEN POSSIBLE...
x+y+z=4
x-y+2z=8
2x+y-z=3
I used the elimination method and broke this down into two equations with only two variables. I try to eliminate another variable, but cannot do it! HELP PLEASE!!
Click here to see answer by Earlsdon(6294)  |
Question 24670: I have worked this problem about 5 times and the answers I get do not satisfy each equation. Could someone please tell me if this equation is inconsistent??
Solve this system of equations, when possible:
x-y+z=7
2x+5y-4z=2
-x+y-z=4
these are the answers I got, but do not satify each equation!
x=-4, y=-6, z=10
x=10, y=6, z=-3
I then multiplied 1)by -2 and 3)by 2 and added them seperatley to 2) and got answers of: 7y-6z=10 and 7y-6z=-12
I then subtracted them and got: 0=-2
which is and inconsistent system, right??!!
Thanks!
Click here to see answer by stanbon(75887) |
Question 24861: i nead healp in this 2?????????
a rental car charges 15 $ per day plus 13 cents per mile to rent a certain car. another agency charges 19$ per day plus 19 cents per mile to rent the same car. how many miles will have to be drive for the cost of a car from the firs agency to equal the cost of a car from the second agency?( raound your answer to the nearlest hundrdth of a mile.) express the problems as a system of a linear equotion and solve using the method of your choice.
Click here to see answer by venugopalramana(3286) |
Question 24930: the question is .. the book says write the equation in slope intercept form and standard form .. and the equation is y - 50 = 8 (x - 4 ) not for standard form i got 8x - y = - 18 .. but for slope intercept i dont understand how you do it .. i looked in to book for te answer and it was y = 8x + 18 .. i keep foing over it but i dont understand how they got that solution
Click here to see answer by smartypants(7) |
Question 24930: the question is .. the book says write the equation in slope intercept form and standard form .. and the equation is y - 50 = 8 (x - 4 ) not for standard form i got 8x - y = - 18 .. but for slope intercept i dont understand how you do it .. i looked in to book for te answer and it was y = 8x + 18 .. i keep foing over it but i dont understand how they got that solution
Click here to see answer by stanbon(75887) |
Question 24974: We are learning standard forms of linear equations. Here are 2 problems i did and the teacher marked wrong,why?
Ax+By=C
1. rewrite this y=2x-7 in standard form: my work: y=2x-7
-2x -2x (minus 2x on both side)
____________
-2x+y=-7 is my ans.
2. rewrite this y= 3/4x-5 in standard form:
my work: y=3/4x-5
4y=4(3/4x-5) multiply by 4 on
both side and use
distributive property
_____________
4y=3x-20
-3x -3x minus 3x on both side
_______________
-3x + 4y= -20 is my ans.
What am i doing wrong?
Click here to see answer by stanbon(75887) |
Question 24895: Hi,
What are the steps to solve a system of linear equation by using the elimination method? I only know how to use the substitution method.
Ex. This one is an example from the text book but I can't really understand.
Please help,
3x - 4y = 1
2x + 3y = 12
Click here to see answer by elima(1433) |
Question 25003: Instructions were to "Solve the system of linear equations"
(There is a bracket( { ) on one side of all three equations)
-x + y + 2z = 1
2x + 3y + z = -2
5x + 4y + 2z = 4
I have read the section explaining this and am still unsure how to start. The other systems that include only two equations were not hard.
Click here to see answer by AnlytcPhil(1806)  |
Question 25093: We are solving for f. The equation is
1/p + 1/q = 1/f
if pg is common deminator then we would multiply each side by pg so
q+p=1/f x pg. So would I then divide each side by pg
so I would get q+p/pq=1/f. The answer in the book is
f=pq/p+q which is the opposite of what I got. Thanks for your help.
Click here to see answer by Earlsdon(6294) |
Question 25270: What is the solution to -7x+2y=-5 and 10x-2y=6 using the method of combinations? Here is what i have tried so far.
-7x+2y=-5
+10x-2y=6
3x=1
/3=/3
x=1/3 here is where i am stuck at with plugging the solution back into the other problem to come up with the y answer.
Click here to see answer by askmemath(368) |
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