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Tutors Answer Your Questions about Linear-systems (FREE)
Question 111545: 20-6x= -4(2x-1)+2
and
3(5x-9)-x= -12+4x
i've answered the first problem already but i'd like to see if you end up with the same answer but i seem to not be able to answer the second problem. Thank you for your time and i greatly appreciate your help!
Click here to see answer by brandonpark2889(31)   |
Question 111671: please help me solve this
a.calculate the value of the discriminant of x^2+x+3=0
b.by examining the sign of the discriminant in part a, how many x-intercepts would the graph of y=x^2+x+3 have?why?
this is under 1 problem. thank you tutor.
Click here to see answer by Earlsdon(4898) |
Question 111668: A small firm produces both AM and AM/FM car radios. The AM radios take 15 h
to produce, and the AM/FM radios take 20 h. The number of production hours is
limited to 300 h per week. The plants capacity is limited to a total of 18 radios per
week, and existing orders require that at least 4 AM radios and at least 3 AM/FM
radios be produced per week. Write a system of inequalities representing this situation.
Then, draw a graph of the feasible region given these conditions, in which x
is the number of AM radios and y the number of AM/FM radios.
Click here to see answer by ankor@dixie-net.com(6691)  |
Question 111861: Hi-
I have been working on this problem and I think I am doing it right. I am about halfway done if I am doing it correctly.
Solve the system by addition:
2x-4y=7
4x+2y=-1
What I did was multiply the second equation by (2)
(2)(4x+2y=-1)
8x+4y=-2
2x-4y=7
_____________
10x/10 = 5/10
and I come up with
x= 1/2
Is that correct?
If so how do I replace work the problem so that I can solve for y?
I am not certain how to multiply to get rid of the fraction at the bottom?
what should I do next?
Click here to see answer by jim_thompson5910(13787) |
Question 111869: I am working on the following problem and hope I did it right.
Adult tickets for a play cost $15 and child tickets cost $6. If there were 33 people at a performatnce and the theater collected $360 from ticket sales, how many children attended the play?
Let X= Adult tix
Let Y= Child tix
1x+1y=33
15x+6y=360
Then I had to multiply the first equation by 15.
(15)(1x+1y) = 33(15)
15x+15y= 495
Then I had to multiply the other equation by -1
(-1)(15x+6y) =360(-1)
-15x-6y=-360
Then I had to add both equations together.
15x+15y=495
-15x-6y=-360 the result was
9y=135
I divided both sides by 9
and came up with y=15.
Is that correct?
I tried to check my work by inputting
1x+1(15)=33
1x+15=33
then subtracted 15 from both sides and came up with x=18.
When I tried to check my work
15(15) +6(18)this is supposed to =360 and I don't think that came out right.
What did I do wrong?
Thank you.
Tracy
Click here to see answer by checkley71(8405) |
Question 112307This question is from textbook
: Solve the system of equation. If the system is consistent, state the coordinates of the point of intersection. If not consistent, state whether it is inconsistent of dependent.
x-y=3
2x+3y=11This question is from textbook
Click here to see answer by jim_thompson5910(13787) |
Question 112619This question is from textbook
: I really need some help!!!! Please!
Solve this system of equation using either addition or substitution method.
George has two investments that yield a total of 185.60 in annual interest. The amount onvested at 8% is 320$ less than twice the amount invested at 6%. How much is invested at each rate.
Amount invested at 8% _____________
Amount invested at 6% _____________This question is from textbook
Click here to see answer by scott8148(3382)  |
Question 80921: Can you please help me with this question I am totally clueless as to how to answer this question the working that is.
Given a line containing the points (1,3) , (2,4) , (3,5) determine the slope- intercept form of the equation, give one additional point on this line and graph the function.
Thank you in advance.
Click here to see answer by mathnard(10) |
Question 113157This question is from textbook
: Having a real hard time with this...please help!
Solve system of equation word problem but either addition method or substitution method.
6x+2y=8
y=-3xThis question is from textbook
Click here to see answer by stanbon(26259) |
Question 113232This question is from textbook
: I just need help setting up the equations and I can do the rest. Word problems have never been easy for me!
Substitution method or addition method from system of equations
George has two investments that yield a total of $185.60 in annual interest. The amount invested at 8% is $320 less than twice the amount invested at 6%. How much is invested at each rate?
Amount invested at 8%?
Amount invested at 6%?This question is from textbook
Click here to see answer by SHUgrad05(58) |
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