Questions on Algebra: Systems of equations that are not linear answered by real tutors!

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Question 712901: i need the answer because i have and they are both no solotution -2x+5x-9=3(x-4)-5
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Question 712915: Is each ordered pair a solution of the given system of equations?
Show your work
2x + 5y=3
y= 7.5x; (1.5,0.2)
Click here to see answer by stanbon(75887) About Me 
Question 713798: Melinda's father Lester is 3 times as old as Melinda. Seven years ago, he was 4 times as old as Melinda. How old is each now?
I set it up like this:
3m = L
4m = L - 7 So 4m = 3m - 7
But then I get m = -7 Which makes no sense to me.
Please help
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Question 713863: The perimeter of a rectangular garden is 96m. The length of the garden is 8 more than the width. Find the length and width of the garden.
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Question 713867: Please help me solve this:
y = 2x - 2
3x + 4y = 3
thank you.
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Question 713867: Please help me solve this:
y = 2x - 2
3x + 4y = 3
thank you.
Click here to see answer by BGutridge(15) About Me 
Question 714153: Use elimination to solve the linear system.
3x-4y=21
4x+2y=6
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Question 714545: Hi!
x+y=2
x*y=-15
Best regards
Richard
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Question 714556: How can you solve this with elimination?
3x + 2y= -6
-x - 2y= 10

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Question 714592: Please help me solve for x in the equation y+2x=12. I am solving with solve systems by substitutions and y is equal to x.
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Question 714705: 3x-4y=-15
5x+y=-2
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Question 714909: Solve the following system of equations. Please show your work to receive full credit.
x - y = 10
2x + y = 2
Explain which method you chose to solve the system and why you felt it was the best choice.
Click here to see answer by mananth(16946) About Me 
Question 715170: I am trying to solve the following problem using a system of equations.
1. A collection of nickels and quarters is worth 4.65. There are 3 more nickels than quarters. Use a system of equations to determine how many coins are in the collection.
I have n+q=4.65, and (3+n(.05))+ q(.25)=total coins, but how do I solve this?
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Question 715480: In his motorboat, Bill travels upstream at top speed to his favorite fishing spot, a distance of 36 miles. It takes him 2 hours. Returning, he finds that the trip downstream, still at top speed, only takes 1.5 hours. Find the speed of Bill's boat and the speed of the current.
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Question 717665: What is the value of x in the following system of equations
y=3x+4
y=2x+15

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Question 717623: Please help me solve this problem:
Tickets to a local movie were sold at $4 for adults and $2.50 for students. If 100 tickets were sold for a total of $355, how many adult tickets were sold?
Thank you:)
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Question 719040: What is -x squared +6x+1 when x equals 7
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Question 719543: 2x+2y=-4
2x-y=6
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Question 719781: solve each system of equations by substitution method 8x+3y=-7
x=3y+15
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Question 719897: Marcy has a total of 30 dimes and quarters. If the total value of the coins is $5.70, how many quarters does she have? Dimes?
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Question 719919: When Butch and Kent left for their trip, the ratio of Butch's money to Kent's money was 7:3. After a short while Butch gave Kent $30, making the new ratio of their cash 3:2. When they started the trip how much more money did Butch have than Kent?
How to solve this problem the correct way? I got the answer by process of elimination (just plugging in numbers till I found the correct answer) but I would like to know how to solve the problem the correct way.
For the first ratio 7:3, I found that Butch started with $210 and Kent with $90 (ratio 7:3)(7x30=210, 3x30=90). So Butch had $120 more than Kent when they started.
For the second ratio 3:2, if Butch gave Kent $30 he would have $180 (210-30=180) and Kent would have $120 (90+30=120) ending up with the correct 3:2 ratio. (3x60=180, 2x60=120).
But how can this be solved without just plugging in numbers until the correct answer is found? Thank you.
Click here to see answer by ankor@dixie-net.com(22740) About Me 
Question 719965: TOPIC- SYSTEM OF EQUATION
how do you solve these two equations x+y=300 and 0.1x+3y=78 by using system of equations?
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Question 720082: Any help I could get on this problem would be greatly appreciated! I cannot figure it out!
A rectangular playground is to be fenced off and divided in two by another fence parallel to one side of the playground. 472 feet of fencing is used. Find the dimensions of the playground that maximize the total enclosed area. Remember to reduce any fractions and simplify your answers as much as possible.

Thank you so much for any help!
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Question 720315: write the slope-intercept form of the equation of each line x-5y=-15
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Question 720757: 1. How do you plot x = 2y, y = x + 2, y = 2x and y = x ÷ 2 on a graph.
Which one of the above formulas describes a line.
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Question 720757: 1. How do you plot x = 2y, y = x + 2, y = 2x and y = x ÷ 2 on a graph.
Which one of the above formulas describes a line.
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Question 720922: –3x + y = 2
–9x + 3y = 6
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Question 721129: Can someone please show the steps for this and give the ordered pair? use the method of substitution to solve the system of linear equations.
2x-y=4
7x-3y=16
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Question 721363: F(x)= -x^2 +6+7
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Question 721406: xy= -3x+5
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Question 721428: A certain region is losing about 14 million acres of rain forest each year.
a. Find a linear function f that calculates the change in acres of rain forest in millions in x years.
b. Find f(7) and interpret the results.
a. f(x)=
b. f(7)=
Interpret the results:
After____years, the region can expect to have lost about_____million acres of rain forest.
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Question 722011: passing through (6, -3), and perpendicular to the line whose equation is x - 3y - 2 = 0 the equation of the line in point slope form is
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Question 723562: I wasn't sure if this is the correct place to put this, but I need some guidance. I cannot figure out this problem:
Solve the system by substitution.
x+y=4
x-y=2
Thank you for any help you can provide.
Click here to see answer by checkley79(3341) About Me 
Question 724258: 13-3x/2-37
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Question 724663: How do I do substitution for
X+y=8
X-y=4
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Question 724666: How do I do substitution and addition method for
X+3y=4
5x-y=4
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Question 724691: which ordered pair is a solution of the equation y=x%5E2-4 and y=-2x-1
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Question 725800: How do you do this equation by adding or using substitution??
4x=-3y-54
X=2y+3
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Question 727655: How do you solve this system of non-linear equations?
xy(x^2 + y^2) = 300
x^2 + xy + y^2 = 37
Thanks in advance...
Click here to see answer by Edwin McCravy(20054) About Me 
Question 727876: a diver jumps from a diving board that is 24 feet above the water. the height of the diver ia given by
h= -16(t-1.5)(t+1)
where the height h is measured in feet and the time t is measured in seconds. when will the diver hit the water?
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Question 729511: Determine if the ordered pair (3,-2)satisfies the system of eguations below. Explain your answer.
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Question 729598: what does -x+1x equal?
I am trying to solve an equation with this in it....just trying to combine like terms thats all
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Question 729662: 10 + 10 x 10% = ?
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Question 729662: 10 + 10 x 10% = ?
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Question 731325: Solve the following system of equations:
5x-2y=8
3x-y=7
thanks
Click here to see answer by Alan3354(69443) About Me