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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 86118: Hi! I was wondering if you could help me with the following problem:
Find the slope of the line perpendicular to -3x+2y=15
If you could help that'd be great!
Thanks.

Click here to see answer by dolly(163)

Question 86597: find three consecutive odd numbers that the sum of the last two bigger numbers is 85 more thean the first
Click here to see answer by ankor@dixie-net.com(22740)

Question 86683: I am so confused with this problem. Can someone show me how this is done?
Find values for m and b in the following system so that the solution to the system is (-3, 4).
5x + 7y = b
mx+ y = 22

Click here to see answer by ptaylor(2198)

Question 84468: What is the solution to the system of equations below?
X + 2Y - Z = -3
2X - Y + 3Z = 14
X + 4Y - 2Z = -8

A. (1,1,6)
B. (1,3,5)
C. (4,-1,4)
D. (2,-1,3)
Click here to see answer by Flake(45)

Question 86906: Yuk! I hate applications. I always get mixed up picking picking what goes where in the equations. I had one person show me how to solve it using just equations, another showed me how by using a table. I'm confused with both of them.
Here it is.
A truck rental agency charges a daily fee plus a milage fee. Mel was charged $85 for 2 days plus 100 miles, and Sarah was charged $165 for 3 days and 400 miles. What is the agency's daily fee and their milage fee?
a) Write the system of equations for this problem.
b) Find the solution.

Click here to see answer by Nate(3500)

Question 86915: If the sum of two numbers is 1, and their difference is 4, what are the two numbers?
Click here to see answer by jim_thompson5910(35256)

Question 86805: linear systems in three variables
2x+3y-6z=4
3x-2y-9z=-7
2x+5y-6z=8
Click here to see answer by Edwin McCravy(20056)

Question 87071: 3x+2y=13
2x+5y=5
Click here to see answer by stanbon(75887)

Question 87113: solve homogeneous system of equations
x - 2y + 3z = 0
3x - 7y - 4z = 0
4x - 4y + z = 0
Thank you

Click here to see answer by Edwin McCravy(20056)

Question 87112: Solve system of equation
3x + 2y - 5z = 6
5x - 4y + 3z = -12
4x + 5y - 2z = 15
Please help! Thank you!
Click here to see answer by longjonsilver(2297)

Question 87262: Can you please help with this question? Thanks Find the equation, in standard form, with all integer coefficients, of the line perpendicular to x + 3y = 6 and passing through (-3, 5).
Click here to see answer by jim_thompson5910(35256)

Question 87119: 2x - y + 2z = -8
-x + 3y - 4z = 15
x + 2y - 3z = 9

Click here to see answer by Edwin McCravy(20056)

Question 87385: One canned juice drink is 15% orange juice, another is 10% orange juice. How many liters of each should be mixed together in order to get 5 liters that is 14% orange juice?
Click here to see answer by stanbon(75887)

Question 87444: 51) You now have had practice solving equations with one variable and equations with two variables. Compare equations with one variable to equations with two variables. How are they alike? How are they different?
Click here to see answer by rapaljer(4671)

Question 87535: Please, I need some help with these problems. If anyone can help please.
1. {4x+y=13
{2x-y=5
2. {2x+4y=6
{5x+10=15
3. {x+y-z=-1
{-4x-y+2z=-7
{2x-2y-5z=7
Click here to see answer by stanbon(75887)

Question 87578: Good Evening Tutor,
I have a question from a question in the textbook. The area of a triangle is
A=1/2bh.
My question asks: Solve each literal equation for the indicated variable.
I am solving (for b) the area of a trapezoid and the equation is
A=1/2h (B+b)
I am unsure how to change the equation to find b can you please explain to me what equation to use and why? I am sure that B+b will be the lengths of the 2 parallel sides but I am unsure how to get to the answer. Thank you greatly for your help.
Click here to see answer by rapaljer(4671)

Question 87577: Find the equation of the lines if:
The line is parallel to the line 3x-7y=15 and has an x-intercept of -5.
Click here to see answer by jim_thompson5910(35256)

Question 87570: x+y=3
x-y=1
Click here to see answer by SandySharma(35)

Question 87678: I really need help on this problem: If f is a linear function and f(0)= 10 and
f(10)= 14, find f(5) and f(-5).
PLEASE HELP ME!!!!!!!!
Click here to see answer by jim_thompson5910(35256)

Question 87668: Find the equation.
The line with the x-intercept 5 and y-intercept -7.
Click here to see answer by tutorcecilia(2152)

Question 87761: Solve graphically:
5x-2y=3
2x-y=0
Click here to see answer by checkley75(3666)

Question 88022: 2x + 4y = -2
3x - 2y = -5

Click here to see answer by uma(370)

Question 88168: Please help me solve this. I have the answer, but I'm stuck on how to work the problem to make my answer match the one that was given to me. I was told to use it as a guide to compare my work to the answer that was given to me and I'm really stuck. The problem is:
1/3x+2/1y=3/1
2/3x-3/5y=2/5
Click here to see answer by stanbon(75887)

Question 88289: Can someone help me with this one
Solve the system by graphing, addition and substitution methods.
5x � 4y = �5
x � 2y = �7

Click here to see answer by rapaljer(4671)

Question 88288: Goodmorning, I need help with this
Solve the system by graphing, addition and substitution methods.
3x + y = �1
9x + 3y = �3
Thank you
Click here to see answer by rapaljer(4671)

Question 88314: I dont understand the following: solve by graphing
x+y=7
2x-y=5
The instructions also say if you solve the system and the variables both add out, you need to tell whether the system consists of lines that coincide (infinite solutions) or parallel lines(no solution)
Click here to see answer by rapaljer(4671)

Question 88547: The graph of y = 2x + 7 is:
A.The same as the graph of y = 2x moved to the right 7 on the x axis
B.The same as the graph of y = 2x moved to the left 7 on the x axis
C.The same as the graph of y = 2x moved up 7 on the y axis.
D.The same as the graph of y = 2x moved down 7 on the y axis.

Click here to see answer by checkley75(3666)

Question 88553: Find the coordinates of the y intercept of 3x-5y=10
Click here to see answer by checkley75(3666)

Question 88553: Find the coordinates of the y intercept of 3x-5y=10
Click here to see answer by stanbon(75887)

Question 88564: 1.Put the equation 3x - 2y = 16 in slope-intercept form.
A.y = -3x + 16
B.-y = 3x - 8
C.y = -5x + 16
D.y = (3/2)x - 8

2.If y varies inversely as x, and y = 8 when x = 4, find x when y = 2
A.1
B.16
C.4
D.8

Click here to see answer by SandySharma(35)

Question 88638: Find the distance of segment PQ with points P(-4,3) and Q(-6,1).
Click here to see answer by jim_thompson5910(35256)

Question 88662: I tried to work the problem and couldn't come up with the same answer that the book has. I just want to know how to work the problem so that I can get the right answer. The book has the answer as (4,3), and I don't understand how it was gotten. Here is the problem, 3x-2y=6 over y=3 the instructions say to solve by graphing.
Click here to see answer by checkley75(3666)

Question 88829: You have at least $30 in change in your drawer consisting of dimes and quarters. Write an inequality that shows the different number of coins in your dresser. I am lost. Any assistance would be extremely appreciated.
Click here to see answer by checkley75(3666)

Question 88826: If anyone can help I will be eternally grateful and interested in if you are a private tutor. How do you graph 4x + y is greater than or equal to 4

Click here to see answer by checkley75(3666)

Question 88812: Evaluate the following expressions when: x = 3, y = 5, z = -6
3x+y
Click here to see answer by praseenakos@yahoo.com(507)

Question 88811: 1.Find the solution of 3x + 6y = 12 when x = 2

2.Given the equation -2y + 4x = 18, find y when x = 1.
3.Write the equation 3x - 4y = 8 in slope-intercept form.
4. The cost Kim pays for chocolates varies directly as the number of pounds of chocolates she buys. She pays $5.40 for 3 pounds of chocolates. Find how much she pays for 5 pounds of chocolates.

Click here to see answer by malakumar_kos@yahoo.com(315)

Question 88824: If anyone can help I will be eternally grateful. How do you graph y>3
Click here to see answer by bucky(2189)

Question 88966: solve using the Multiplication principle first then add
X=3Y, 5X+14=Y
Click here to see answer by checkley75(3666)

Question 88974: In this problem, I have to solve for y:
5x+4y=12
Click here to see answer by checkley75(3666)

Question 89045: i. Explain how to apply elimination in solving a system of equations.
ii. Explain how to apply substitution in solving a system of equations.
iii. Demonstrate each technique in solving the system

1. 3x + 9y = 12
2. 5x - 4y = 3

Click here to see answer by malakumar_kos@yahoo.com(315)

Question 89067: find the value of k that will make the lines 2x + y = 3 and kx + y = -1 parallel
Click here to see answer by tutor_paul(519)

Question 89357: -4(2x-3)=-8x+5
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 89305:
Problem 1. D= C-S/N (for S)

Problem 2. A=1/2h(B+b)(for b)
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 89370: Can you please assist? I am not sure I am doing each step correctly. Thanks in advance!!
solve 2(x-4)=2[x-3(x-1)+2]

Click here to see answer by ptaylor(2198)

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