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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 374716: b=3c for c
Click here to see answer by Fombitz(13828)

Question 374764: Please solve each system
-8x - 7y =2
7x + 6y = -1
Click here to see answer by jim_thompson5910(28503)

Question 374762: Please solve each system
-5x + 2y = 9
-3x + 8y = -15
Click here to see answer by jim_thompson5910(28503)

Question 374967: solve the following system of equations and show all of your work.
2x +5y = -3
-15x - 5y = -10

Click here to see answer by Fombitz(13828)

Question 375032: y=3x
2x+y=5
This is the substitution method.its one problem.Please help me find the answer to this problem
Click here to see answer by jim_thompson5910(28503)

Question 375053: what formula you use to find out the area of a triangel
Click here to see answer by jim_thompson5910(28503)

Question 375120: What is the linear equation of -2x+3=4y
Click here to see answer by checkley79(3050)

Question 375250: Use Substitution ,ethod to find the simultaneous solution.
-3x+y=17
2x-3y= -23
Click here to see answer by robertb(4012)

Question 375261: i need a graph that shows all four quadrents useing the inequalty x+y>1
Click here to see answer by Fombitz(13828)

Question 375248: Use Addition method to find the simultaneous solution.
5x+9y= -19
2x-3y= -12
Click here to see answer by Fombitz(13828)

Question 375372: which of these images represents the following system of equations being solved graphically?
-10x-4y=100
2x+6y=-20
Click here to see answer by Alan3354(30982)

Question 375498: Write With Radicals. Assume that all variables represent positive real Numbers
(mn)^1/5
Click here to see answer by Fombitz(13828)

Question 375500: equation in point slope form [3,-4]=6
Click here to see answer by Fombitz(13828)

Question 375492: I am a little confused on this math problem? f(x)=3x(2)-2x+1
I hope someone can explain it to me. Are all linear equations functions?
Click here to see answer by nyc_function(2733)

Question 376106: Find the x-and y- intercepts algebraically, showing all work.
y=-(2/3)x+30
Click here to see answer by nerdybill(6948)

Question 376187: How much water per gallon would a person use in a week if they used 55gallons a day and 20gallons less on Sunday?

Click here to see answer by amoresroy(333)

Question 376337: Solve the system by addition:
x-y = -1
5x+2y = 30
Click here to see answer by jim_thompson5910(28503)

Question 376340: Solve the system by addition:
5x+y= -2
3x-2y= 4
Click here to see answer by jim_thompson5910(28503)

Question 376347: the problem that I am solving through substitution is 9x + 2y = -51(equation 1) and -9x + y =69(equation 2), I substituted with a fraction in place of x and also got a fraction for y and it was wrong, how do I properly calculate fraction answers at this point?
Click here to see answer by jim_thompson5910(28503)

Question 376372: Find the values of x and y that solve the following system of equations:
-5x - 2y = 13
7x - 3y = 5
Click here to see answer by jim_thompson5910(28503)

Question 376405: Solve the linear system using substitution.
x = −7 − 2y Equation 1
y = x − 11 Equation 2
Click here to see answer by mananth(12270)

Question 376493: solve for x
x/4+x/5=9/20
Click here to see answer by Alan3354(30982)

Question 376491: Simplify.
9v - 10v
Click here to see answer by rfer(12646)

Question 376543: x-2y=5 and 4x+y=65
Click here to see answer by ewatrrr(10682)

Question 376661: what is the solution of the system 7r-9s=17 9r+7s=59
plz and thank you
Click here to see answer by jim_thompson5910(28503)

Question 377383: Hi could you please explain how to use substitution through this problem? I have tried numerous times and i am not quite sure if i have done it correctly.
x-2y=1
6x-5y=20
Click here to see answer by rfer(12646)

Question 377513: suppose that y varies directly as the sqaure root of x, and that y=32 when x=16. What is y when x=50?
Click here to see answer by mananth(12270)

Question 377513: suppose that y varies directly as the sqaure root of x, and that y=32 when x=16. What is y when x=50?
Click here to see answer by ewatrrr(10682)

Question 377618: I am needing help with this verbal problem please read entire thing to the bottom as is a little long and Thank you for you help.
a. when x=75
c=2x+20
=2(75)+20
=150+20
=170
we have the ordered pair(75,170)

b.when x=300
c=2x+20
=2(300)+20
=600+20
=620
we have the ordered pair(300,620)
c. when x=1000
c=2x+20
=2(1000)+20
=2000+20
=2020
WE HAVE THE ORDERED PAIR (1,000,2020)
In the example, find the number of units produced when the total cost is (a)$430, (b)$700 and (c)$1,400. write the answers as ordered pairs. I am really confused as to how to do this and the steps to take to do this. I would really appreciate some help on this.

Click here to see answer by ewatrrr(10682)

Question 377701: What is the x-intercept and y-intercept of the equation 13x+24y = -5 (no fractions)?
Click here to see answer by Fombitz(13828)

Question 377745: 16+40 divided by 5 = n
Click here to see answer by Alan3354(30982)

Question 377860: I need to write an equation in standard form of the line that passes through the given point and has the given slope.
(4,3),m=7

Click here to see answer by mananth(12270)

Question 377896: y=2x=1;x=-1,x=-2,y=3 find the solutions of the given equation using the given values of x and y. i am not quite sure how to do this could you help me please?
Click here to see answer by stanbon(57239)

Question 377924: y=2x-8 plot the graphs of the given linear equations using the x and y intercepts and a checkpoint. I don't get it??
Click here to see answer by nyc_function(2733)

Question 377996: It takes Cathy 1.5 hours to paddle her canoe 6 miles upstream. Then she turns her canoe around and paddles 6 miles downstream in 1 hour.
What is the rate of the current?
What is Cathys paddling rate in still water?
Click here to see answer by stanbon(57239)

Question 378045: A man is nine times as old as his son. In nine years, he will be only three times as old as his son. How old are each now?
Show all three methods (graphing, substitution and elimination) for solving.
Click here to see answer by richard1234(5390)

Question 378058: A man is nine times as old as his son. In nine years, he will be only three times as old as his son. How old are each now?
Solve using elimination method.
Click here to see answer by mananth(12270)

Question 378082: Solve by addition method.
2/3x - 1/2y = 1
1/3x - 1/4y = 1/2
Click here to see answer by mananth(12270)

Question 378019: 5x=2y-10 plot the graphs of the given linear equation using the x and y intercepts and a checkpoint. What are the steps I take to find this solution?

Click here to see answer by mananth(12270)

Question 378012: With a tailwind, a jet flew 2000 miles in 4 hours. The jets return trip against the same wind required 5 hours.
Find the jets speed and the wind speed.
Click here to see answer by mananth(12270)

Question 377179: Solve using the substitution method:
x-y=5 x+2y=7
I came up with 15y=7
Click here to see answer by nyc_function(2733)

Question 378312: how do you solve 8x+64?
Click here to see answer by richard1234(5390)

Question 378568: How do I simply the linear inequality:
x+y>-8
So that Y is on one side like y>3x-2
Click here to see answer by rapaljer(4667)

Question 378670: using elimination method solve:
2y+5x=7
2x-4y=10
(the page isnt coming up right. i hope you get this anyways!)
Thanks(:
Click here to see answer by richard1234(5390)

Question 378670: using elimination method solve:
2y+5x=7
2x-4y=10
(the page isnt coming up right. i hope you get this anyways!)
Thanks(:
Click here to see answer by jim_thompson5910(28503)

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