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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 119112: 3x-3y+3z=-27
2x+2y+3z=-3
-3x+2y+2z=-3
Click here to see answer by Fombitz(13828)

Question 119180: A light plane flew from its home base to an airport 255 miles away. With a headwind, the trip took 1.7 hours. The return trip with tailwind took 1.5 hours. Fine the average airspeed of the plane and the average wind speed.
Click here to see answer by checkley71(8403)

Question 119179: A light plane flew from its home base to an airport 255 miles away. With a headwind, the trip took 1.7 hours. The return trip with tailwind took 1.5 hours. Fine the average airspeed of the plane and the average wind speed.
Click here to see answer by checkley71(8403)

Question 119273: The value of a "Mint State-63" (unicirclated) 1950 Jefferson nickel minted at Denver is 8/7 the value of a similar condition 1945 nickel minted at Philadelphia. Together, the total value of the two coins is $15.00. What is the value of each coin?
n+8/7n=15
Click here to see answer by tutorcecilia(2152)

Question 119333: I need to graph this equation:
x+6=-5
it's supposed to be standard form like
Ax+By=C
My teacher said to use the numbers -2 -1 0 1 2 3
but they don't work.
Click here to see answer by Fombitz(13828)

Question 119387: Solve each of the following systems by graphing

2x – y = 4 and 2x – y = 6
x-2y =8 and 3x-2y=12

Click here to see answer by checkley71(8403)

Question 119436: solve each system by substitution

y=x+3
y=2x+4
Click here to see answer by HyperBrain(694)

Question 119517: 3/5x-2/5y=5
Click here to see answer by MathLover1(6627)

Question 119639: Please show me how to solve this problem:
2t + 4s = 10
3t + 3d = 9
1t + 3d + 2s = 8
Click here to see answer by stanbon(57307)

Question 119769: solve by substitution
x-y=-3
x-y=4
Click here to see answer by checkley71(8403)

Question 119693: complete ordered pair solutions

3x+4y+12 (0,),(,3\4) ,(,0),(8\3,)
Click here to see answer by checkley71(8403)

Question 119807: Can you show me how to solve this system of equations: y=3x
x+21=-2y
by the substitution method?
Click here to see answer by jim_thompson5910(28555)

Question 119835: How do you solve this system of equations where 4x+3y=-2
5x+7y=17
by using the elimination method?
Click here to see answer by jim_thompson5910(28555)

Question 119835: How do you solve this system of equations where 4x+3y=-2
5x+7y=17
by using the elimination method?
Click here to see answer by kjwade3(1)

Question 119870: I need assistance on the following.
I need to solve by graphing.
Thank You
3x+4y<12
x+3y<6
x>0
y>0

Click here to see answer by jim_thompson5910(28555)

Question 120008: Please please help me with this problem!
This problem is about using Point-Slope Form and asks to graph each equation. What is ? i need to know what is the slope and which is the rise and run.
I think that might be like; slope= 0, and rise over run = -3 over -2. I'm really confused i think i know how to graph the equation.
Thank You SO much
Click here to see answer by stanbon(57307)

Question 120011: i need to find the solution to these system of equations by substition method.
y=4-3x
y=2x-1
Click here to see answer by stanbon(57307)

Question 120020: Am I asking this correctly? The directions say: Use the substitution method to solve the linear system.
Problem:
1. y = x + 2
2x + y = 8

Click here to see answer by stanbon(57307)

Question 120015: i need help sloving this system if equation by substitution
2x-2y=4
x+3y=1
Click here to see answer by jim_thompson5910(28555)

Question 120133: I don't really understand how to do the substitution method.
How would you answer
Click here to see answer by jim_thompson5910(28555)

Question 120131: 7x-y=10
x=2y-6
I have to solve this problem using substitution and I don't understand and I'm really confused could someone please help me?
Click here to see answer by jim_thompson5910(28555)

Question 120129: 2x+3y=24
y+7x=46
I have to solve this problem using elimination and I don't understand could someone please help me?
Click here to see answer by jim_thompson5910(28555)

Question 120128: 6x+3y=-2
9y+10x=-2
I have to solve this problem using elimination and I don't understand this at all could someone please help me!
Click here to see answer by jim_thompson5910(28555)

Question 120188: Use substitution or elimination to solve each system of equations. Please explain.

7. 2x + 5y=16
5x - 2y= 11
Click here to see answer by jim_thompson5910(28555)

Question 120130: 3x-4y=-1
11y+2=13x
I have to solve this problem using substitution and I don't understand could someone please help me?
Click here to see answer by ankor@dixie-net.com(15649)

Question 120332: USE THE SUBSTITUTION METHOD OR LINEAR COMBINATION TO SOLVE THE LINEAR SYSTEM AND TELL HOW MANY SOLUTIONS THE SYSTEM HAS. THEN DESCRIBE THE GRAPH OF THE SYSTEM.
24) -7X+7Y=7
2X-2Y=-18
25)2X+4Y=-8
2X+2Y=-4
26)2X+Y=-4
4X-2Y=8
Click here to see answer by checkley71(8403)

Question 120342: which equation is bets use for the problem y=-x+6 and x-2y=-6
Click here to see answer by jim_thompson5910(28555)

Question 120346: elimination substitution, or graphing best fits 2x-2y=-4 and y=2
Click here to see answer by jim_thompson5910(28555)

Question 120386: I got this as homework, i'm in grade 5, and I just need some help.
A1.Express Each sentence as a mathematical equation.
a)five times a number is equal to fifteen.
b)Twice Mary's age is thirty.
c)A number increased by seven is equal to thirteen.
d)A number decreased by two is equal to eleven.
e)Six less that a number is equal to fourteen.
f)Bill's age two years ago was ten.
g)Nicole's age five years from now will be twenty-one.

A2.What is the coeffecient of each term?
a)5w
b)-3w
c)-7y
d)m
e)-4.3m
f)-6
g)-m
h)3/4m
A3.Solving
a)x^5*x^7=
b)a^9/a^5=
c)y^12
Click here to see answer by heidi(17)

Question 120422: How would I solve 4a - 7b = 13
2a - 7b = 3
Using elimination?
Thanks!
Click here to see answer by jim_thompson5910(28555)

Question 120374: I'm taking an Algebra 2 exam tomorrow and trying to review as best I can but I can't remember everything we've gone over in the semester. I was just wondering about parallel equations. How can you tell that the equation is in fact parallel so you don't have to work it all out and notice it once you see it? Thanks.
Click here to see answer by ankor@dixie-net.com(15649)

Question 120439: Several students decide to start a T-shirt company. After initial expenses of $280, they purchase each T-shirt for $3.99. They sell each T-shirt for $10.99. How many must they sell to break even?
Click here to see answer by josmiceli(9669)

Question 120508: solve the system by addition and substitution methods
4x-4y=-8
y=2+x
Click here to see answer by jim_thompson5910(28555)

Question 120532: Please solve the system by addition and substitution methods.
3x-y=1
3x-y=2
I can determine that by looking at the equations that there is no solution. But I can not figure out how to do the math to prove my theory.
Click here to see answer by jim_thompson5910(28555)

Question 120563: The sum of two numbers is 50 and their difference is 18. Find the numbers.
Im so confused could someone please help?
Click here to see answer by jim_thompson5910(28555)

Question 120563: The sum of two numbers is 50 and their difference is 18. Find the numbers.
Im so confused could someone please help?
Click here to see answer by solver91311(16877)

Question 120556: The length of a rectangle is 20cm greater than its width. The perimeter is 360cm. What is the area?
I really don't understand this, could someone please help?
Click here to see answer by tutor_paul(490)

Question 120555: Last year Sue was three times as old as Pablo. Next year she will be twice as old as Pablo is. How old is each now?
I don't understand this at all.): Could someone please help me?
Click here to see answer by ankor@dixie-net.com(15649)

Question 120557: Sally has $21.40 in dimes and quaters, for a total of 100 coins.How many of each kind of coins does Sally have?
I dont understand this, could someone please help?
Click here to see answer by ankor@dixie-net.com(15649)

Question 120592: Okay the question is :
A telephone company charges $4.95 per month for long distance calls plus $.05 per minute. The monthly cost (c) of long distance calls can be described by the equation c= 0.05m + 4.95 where m is the number of minutes. Set this equation up so that it is able to be graphed.
Click here to see answer by josmiceli(9669)

Question 120560: A movie theater charges $4 for an adult ticket and 2$ for a child's ticket. one night 380 tickets were sold for a total of $1320. How many children attended the movie that night?
I am soooooo confused could someone please help me?
Click here to see answer by Fombitz(13828)

Question 120606: y=x+2
2x+y=11
Could someone please help me?
Click here to see answer by jim_thompson5910(28555)

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