Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 650978: hi,im a student 15 years old, having trouble with finding the solution to this question.
6x + 5y = 7 & x - y = 3

i have to find the coordinates (x,y) i found that the answer is x= 2 and y = -1
but i dont know how to find the soulution. Please help thanks.
Click here to see answer by nerdybill(7384)

Question 651297: -4x-2y=-12
4x+8y=-24
Click here to see answer by nerdybill(7384)

Question 651508: hi, I am very lost and I don't know how to make a word problem with these equations y=3x-2 and x-y=4 can you please help

Click here to see answer by Alan3354(69443)

Question 651501: 39. What is the value of x if 1 minus the reciprocal of (1-x) equals the reciprocal of (1-x)? (MAO 1992)
Click here to see answer by MathLover1(20850)

Question 651727: x+y-4=0 and 2x-y-2=0 awaiting the point (0,0) find the equation of a straight line
Click here to see answer by stanbon(75887)

Question 652103: Pivot the system about the element in row 2, column 2.

1 5 �10 0
0 5 �6 �6
0 10 8 �5

Click here to see answer by MathLover1(20850)

Question 652101: Determine the value of k for which the system of linear equations has no solution.
2x - y = -15
8x + ky = 14

Click here to see answer by shweta(56)

Question 652343: The sum S of the measure of the measures of the angles of a polygon is
S=(n-2)*180 degrees, where n is the number of sides of the polygon. Plot four points (n,s) that satisfy the equation . Do the points lie on a line? Explain your reasoning
Click here to see answer by stanbon(75887)

Question 652408: Solve the system of linear equations by graphing and write an ordered pair
3x+y=0
4x-y=7
Click here to see answer by MathLover1(20850)

Question 652418: factor by completing the square. please show how the work is done. I can get the answer but do not know how to work the problem. Thank you.
x^2+3x-1=0
Click here to see answer by ankor@dixie-net.com(22740)

Question 652617: I would greatly appreciate your help
11z/16 + 7z/8 = 5/16
Click here to see answer by unlockmath(1688)

Question 652705: i don't understand how to graph this equation y=10+2(x-4)
Click here to see answer by solver91311(24713)

Question 652705: i don't understand how to graph this equation y=10+2(x-4)
Click here to see answer by MathLover1(20850)

Question 652735: what is x in ; 1/3x + 1/2 = 11/12
Click here to see answer by unlockmath(1688)

Question 652735: what is x in ; 1/3x + 1/2 = 11/12
Click here to see answer by Aaniya(63)

Question 652796: Hi I need help graphing y=-2/3x+30
Thanks in advance for all of your help have a great day!!
Click here to see answer by stanbon(75887)

Question 653395: Solve: 4(x + 6) = 6(x − 2)
Click here to see answer by jim_thompson5910(35256)

Question 653400: There are 35 people in a room. There are 7 more males than females in the room. How many males are there? How many females ?
Click here to see answer by solver91311(24713)

Question 653459: Solve the equation:
4(n-2)-6(n+3)=-14
Click here to see answer by stanbon(75887)

Question 653876: How do you write constraints in slope intercept form?
Click here to see answer by solver91311(24713)

Question 654013: Solve the following equation. Then place the correct answer in the box provided. Answer in terms of a mixed number.7(2x + 6) = 1
Click here to see answer by checkley79(3341)

Question 654351: 12t+9y=14
6t=7y-16 by elimination using the add/ subt method
Click here to see answer by lynnlo(4176)

Question 654480: It takes Karina 3.5 hours to drive from Davenport to Hogsdale and then 2 hours and 10 minutes to drive from Hogsdale to Paqua. On the route that she took, it is 720 miles from Davenport to Paqua. What was her average driving speed for the trip?
Click here to see answer by solver91311(24713)

Question 654502: -2x +6y =-38
3x -4y=32 what is the x coordinate of the solution to the system??
Click here to see answer by MathLover1(20850)

Question 654594: One of two complementary angles is 8 degrees less than the other.
Which of the following systems of equations represents the word problem?
x + y = 90 and x - y = 8
x + y = 90 and 90 - x = 8
x + y = 90 and y = 8x
Click here to see answer by checkley79(3341)

Question 654507: i need help with problems like this. i know it says only one problem per submission but i cant figure out how to ask another question. i have tried to solve these two problems but they are extremely difficult for me and i cant find any good examples anywhere else. please help :( thanks
_______________________________________________________________________________
a restaurant manager bought 80 lb of hamburger and 30 lb of steak for a total cost of 163 a second purchase at the same prices includes 150 lb of hamburger and 50 lb of steak and costs 290 find price of 1 lb of hamburger
__________________________________________________________________________________
a coin bank contains only dimes and quarters the total value is 3.70. if the dimes were quarters and the quarters were dimes the total value would be 2.95 find the number of quarters
_______________________________________________________________________________
Click here to see answer by ankor@dixie-net.com(22740)

Question 654664: I need to remember the y=mx+b formula and how to solve and graph it. I appreciate the help.
Click here to see answer by MathLover1(20850)

Question 655093: What is 6 times the difference of n and 6?

Click here to see answer by checkley79(3341)

Question 655156: Find the slope of a line perpedicular to the line containing the points (-1, -11) and (9, 10)
Which line would be perpendicular to y = 3x + 2?
a) 3x-y=-1 b)y-3x=-1 c) x+3y=-1 d) 6x-2y=-1

PLEASE HELP ME!
Click here to see answer by nerdybill(7384)

Question 655155: Write the standard form of the equation of the line with a slope 2/7 passing through the point (7, -4)
A line (L1) has a slope of 1. The line through which of the following points is perpendicular to L1?

PLEASE HELP ME!
Click here to see answer by nerdybill(7384)

Question 655283: I need help on understanding how to solve this problem using substitution and elimination. Please show me how:
4x+5y=13
4x+3y=9

Click here to see answer by MathLover1(20850)

Question 655283: I need help on understanding how to solve this problem using substitution and elimination. Please show me how:
4x+5y=13
4x+3y=9

Click here to see answer by ewatrrr(24785)

Question 655332: which ordered pair is a solution to hte system 3x+2y=-9 and 5x-3y=4
Click here to see answer by MathLover1(20850)

Question 655397: the sum of the digits of a two digit number is 10. The number formed by reversing the digits is 4 less than 5 times the original number. Find the original number.
can you explain this one to me thank you so much.
Click here to see answer by lwsshak3(11628)

Question 655396: one number is 32 more than the second number twice the first number is 4 more than 8 times the second number. Find the numbers.
Click here to see answer by lwsshak3(11628)

Question 655431: 1/2x-3=11/5-3/4x
Click here to see answer by rfer(16322)

Question 655431: 1/2x-3=11/5-3/4x
Click here to see answer by stanbon(75887)

Question 655527: Use the method of substitution to solve the system of linear equations.
3a=7-b
3a=2-b
__A. There is one solution. The solution is __.
__B. There are infinitely many solutions.
__C. there are no solutions.
Click here to see answer by jim_thompson5910(35256)

Question 655526: I really need help.
A tugboat goes 140miles upstream in 10 hours. The return trip downstream takes 5 hours. Find the speed.
the speed pf the tugboat is ___mph, and the speed of the current is ___mph.
this is substitution to solve linear equations.
Click here to see answer by jim_thompson5910(35256)

Question 655525: use the method of substitution to solve the system of linear equations.
2x-y=4
9x-4y=19
The solution is ______
Please help me solve this.

Click here to see answer by jim_thompson5910(35256)

Question 655837: Using the elimination method, how do you solve this?
A+7B=9
A+4B=3
Click here to see answer by Alan3354(69443)

Question 655838: Why is it useful to rewrite a formula in terms of another variable?
Click here to see answer by josmiceli(19441)

Question 656168: Solve the linear system of equations
9x-7y=63
45x-35y-18
Click here to see answer by MathLover1(20850)

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