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

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Question 477473: Solve each system of equations by using substitution.

I've multiplied the bottom equation by 3 and got 9x - 15y = 60, but it isn't going to be correct because 8x - 9x = -x so the x hasn't been eliminated. I don't know what to do about it. The rest of the problem made no sense because the numbers were too high after I plugged them in. I got -x + -6 = -51 then divided that by -6 which got me 8.5. I didn't know what to do with the -x so I just ignored it bu I don't think that's right. Any solutions?
Click here to see answer by ewatrrr(10682)

Question 477781: solve (x-5)^2=51
Click here to see answer by mananth(12270)

Question 477844: Which of the following equations is a quadratic equation ?
a. y = x^2 + 4
b. y = 1/2x^2
c. y = 3x - 9
d. y = 3x^3
Click here to see answer by stanbon(57347)

Question 477998: Solve the system
2x-3y+z=13
x+2y+3z=2
3x-y+z=12
Click here to see answer by MathLover1(6632)

Question 478004: The sum of two numbers is 248. Their difference is 64. find the number.
Click here to see answer by Theo(3464)

Question 478331: My question is: Find any intersection points of the graphs of the equations.
y=2x^2
y=x^4-2x^2
can you please explain how to solve this problem for future reference :) Thank You
Click here to see answer by lwsshak3(6505)

Question 479019: evaluate P(12,3)
Click here to see answer by stanbon(57347)

Question 479127: solve by the substitution method.
x^2+y^2=13
2x-3y=0
Click here to see answer by Tatiana_Stebko(1326)

Question 479139: solve triangle ABC by using the Law of sine. A=115, a=70m, b=31m. Round all sides and angles to the nearest tenth.

Solve triangle ABC by using the Law of Cosines. B=106, a=14.6, c=10.5. Round all sides and angles to the nearest tenth.
Click here to see answer by Theo(3464)

Question 479262: (x-5)^2 = 51
Click here to see answer by stanbon(57347)

Question 479537: Hello,
These are the problems that I am having trouble with:
Solve:
1. -3x^2 + 5x - 1 = 0
2. x^2 + 6x + 6 = 0
Please and thanks!
Click here to see answer by jorel1380(2518)

Question 480091: Find the slope-intercept form, standard form and point slope form of the equation of the line
described

A line with y-intercept of (0, -3) and x-intercept of (-5, 0)
Click here to see answer by Alan3354(30993)

Question 480360: calculate the discriminant
4x^2-4x+1=0
Click here to see answer by mananth(12270)

Question 480356: calculate the discriminant
4x^2 -6x+4=0
Click here to see answer by Alan3354(30993)

Question 480410: Solve the following systems of equations:
x+9y=3 (1)
x=7-9y (2)
Click here to see answer by jorel1380(2518)

Question 480406: 2x=y+3
x+2y=6

Click here to see answer by jorel1380(2518)

Question 480424: x^2+y=21
-4x-y=0
Click here to see answer by mananth(12270)

Question 480516: tomatoes are on special 4 for $1.80. i only want to buy two. what will my cost be?

Click here to see answer by Tatiana_Stebko(1326)

Question 480647: The sum of the digits of a two-digit number is 13. When the digits are reversed, the new number is 27 more than the original number. What is the original number?
(The worksheet says at the top "Applying Systems")
Click here to see answer by Anthea Lawn(22)

Question 480790: x^2+y=18
-3x-y=0
Click here to see answer by mananth(12270)

Question 480794: This question did not get answered I've only asked one for the.
x^2+y=18
-3x-y=0
Click here to see answer by bluelove30(1)

Question 480913: With a tailwind, a helicopter flies 300 miles in 1.5 hours. When the helicopter flies back against the same wind, the trip takes 3 hours. What is the helicopter's speed? What is the wind's speed?
Click here to see answer by stanbon(57347)

Question 480912: Alex is 6 years older than Frank. The sum of their ages is 50. Find Alex's age and Frank's age.
Click here to see answer by Maths68(1474)

Question 481126: Good day tutors of algebra.com
I dunno if I posted to the right category but here goes
Jack starts walking at 4kph . After a time , he hitches a ride with an old truck that travels 30kph . In 10 hours of walking and riding , he covers 157km . How long did he walk and how long did he ride?
I'm so confuse with this question because the distance was combined
thanks in advance
Click here to see answer by mananth(12270)

Question 481572: what is x if : logx^(16)=-2
Click here to see answer by jim_thompson5910(28595)

Question 481991: solve the following system equation 2x=3y=-16,5x-10y=20
Click here to see answer by jim_thompson5910(28595)

Question 485190: how do i solve for y
the problem is 3x-y^2=3
Click here to see answer by stanbon(57347)

Question 485583: 3x-5y+2z=-12
x+4y-2z=8
-3x+5y-2z=12
Click here to see answer by Edwin McCravy(8909)

Question 485942: 8x+7y=-6
x=24-5y
Click here to see answer by mananth(12270)

Question 486482: find the x and y intercepts of the equation:2x+5y=10

Click here to see answer by Tatiana_Stebko(1326)

Question 486338: SOLVE
If p < x < q and r < y < s and you know that x > y is true, which is correct:
A) r < q
B) q = s
C) p < r
D) p > r
This is how I thought about this:
p < x r < y x > y
x < q y < s
p < q r < s
But it brought me to consider:
A) is true; B), C) & D) are False.

Click here to see answer by richard1234(5390)

Question 487953: How do I solve for X:
ax+bx=c
Click here to see answer by richard1234(5390)

Question 489212: -1(3-x)
Click here to see answer by MathLover1(6632)

Question 489751: If someone could help with this problem I would appreciate

3x-6y=18
6x-2y=-12
Click here to see answer by josmiceli(9678)

Question 490732: What is the solution set of the system of equations below?
2x+5y=8
6x+4y=-20
(What I believe is you should do something with X since it has a common factor of 2 but I could be mistaken).
Click here to see answer by nerdybill(6958)

Question 490758: I am not sure if I chose the right topic to type this under: I have to use the substitution method to solve systems of equations. the problem I have is:
2x + 2y = 41
x + 2y = 0
Click here to see answer by jim_thompson5910(28595)

Question 490761: Solving systems of equations, use either substitution or elimination method.
The problem I have is:
1/2x - 7/5y = -1
1/3 x + y = 9
My teacher has the answer as x=12, y=5
I cannnot get this answer.
Thank you very much for your help!!! Cindy
Click here to see answer by ankor@dixie-net.com(15652)

Question 490787: Factor each polynomial.
6x^2+17x+10

Click here to see answer by scott8148(6628)

Question 490786: What is the solution set of the system of equations below?
y=-x+5
y=x-3
I am not sure what to do in this problem?
Click here to see answer by Alan3354(30993)

Question 491601: From a 220 feet high lighthouse in the Bahamas island of Nassau, a person sees a ship on the horizon. Due to the curvature of earth, how far is the ship from the lighthouse?
•Use the formula: d = sqrt[3h/2], where d is the distance in nautical miles and h is the height in feet.
Provide a similar example of when you were close to the beach, or elsewhere. Estimate how high above sea level you are and find how far the ship is from you.

Click here to see answer by ankor@dixie-net.com(15652)

Question 491998: 2x + 8y = 80
-2x + 2y = 0
Click here to see answer by ptth176(50)

Question 491998: 2x + 8y = 80
-2x + 2y = 0
Click here to see answer by deborabr(181)

Question 492016: Solve the following systems of equations for both x and y.
6x + 7y = 80
2x + 5y = 48
Click here to see answer by MathLover1(6632)

Question 491708: y=2x+3 and y=-x-4
Click here to see answer by ptth176(50)

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