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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 376493: solve for x
x/4+x/5=9/20
Click here to see answer by Alan3354(69443)

Question 376491: Simplify.
9v - 10v
Click here to see answer by rfer(16322)

Question 376543: x-2y=5 and 4x+y=65
Click here to see answer by ewatrrr(24785)

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(35256)

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(16322)

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(16946)

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(24785)

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(24785)

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(32388)

Question 377745: 16+40 divided by 5 = n
Click here to see answer by Alan3354(69443)

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(16946)

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(75887)

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(2741)

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(75887)

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(7193)

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(16946)

Question 378082: Solve by addition method.
2/3x - 1/2y = 1
1/3x - 1/4y = 1/2
Click here to see answer by mananth(16946)

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(16946)

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(16946)

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(2741)

Question 378312: how do you solve 8x+64?
Click here to see answer by richard1234(7193)

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(4671)

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(7193)

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(35256)

Question 378669: y=-3/2x-4
y=1/2x+4
Click here to see answer by Wingsong(2)

Question 378669: y=-3/2x-4
y=1/2x+4
Click here to see answer by Alan3354(69443)

Question 378720: 4x+5y=5
8x+10y=10
solve using the elimination method
Click here to see answer by jim_thompson5910(35256)

Question 378876: Solve the system by linear combination.
3x + 4y = 19
3x + 6y = 33

Click here to see answer by Alan3354(69443)

Question 379405: if a caterer charges a fixed cost for preparing a dinner plus an additional cost for each person served and you know that the cos will be for 100 students will be $750 and the cost for 150 students will be $1050,what would the caterer's fixed cost and the cost per student be?(using linear equations)
Click here to see answer by stanbon(75887)

Question 379446: b) A family of 2 adults and 3 kids go and watch a movie. The price of an adult ticket is m and the price of a child ticket is n such that:
2m + 3n = 28 and n = 12 - m
I thought I would solve it by simply doing
2m+3(0)=28 and then solve for n the same but this is not working out.
2m=28
m=14

Click here to see answer by rapaljer(4671)

Question 379503: An algebra teacher drove by a farmyard full of chickens and pigs. The teacher happened to notice that there were a total of 100 heads and 270 legs. How many chickens were there? How many pigs were there?
Click here to see answer by ptaylor(2198)

Question 379752: What is the linear equation for 4x-2y=-1
Click here to see answer by fractalier(6550)

Question 379760: The Everton college store paid $1644 for an order of 44 calculators. The store paid $9 for each scientific calculator. The other, all graphic calculators, cost the store $57 each. How many types of each calculator was ordered?
Click here to see answer by Edwin McCravy(20056)

Question 379867: what does d cubed mean

Click here to see answer by richard1234(7193)

Question 380048: determine whether each of the following ordered pairs are solutions to the linear equations given
(-3,-8):y=5x+7?
(3,4):5x-2y=6
Click here to see answer by rfer(16322)

Question 380592: determine whether or not the following given ordered pairs, labeled a,b and c are solutions to the given equations.
y=3x-1 A.(1,2)
B.(-1,-4)
C.(2,3)
how do I do this?
Click here to see answer by stanbon(75887)

Question 380598: Find the missing component in each ordered pair using the given equation.
y=2x+1 A.(1,_)
B.(2,_)
C.(_,-3)
D.(_,-5
Click here to see answer by rfer(16322)

Question 380551: How do you graph y=x-4...?
Click here to see answer by rfer(16322)

Question 380568: x-3y=-16 and 2x+7y=33

Click here to see answer by Fombitz(32388)

Question 380797: How do you work out the problem 15t-4>11t-16?
Click here to see answer by nerdybill(7384)

Question 380842: I am so confused. I don't understand how to do the following problem:
4x-2y=12 directions say Plot the graphs of the following given equations.Use the "X" and "Y" intercept method, and a check point. Use the given "X" value when solving for the check point. Really confused please help me understand.
Click here to see answer by rfer(16322)

Question 380853: uggh.. still don't get this its says plot the graphs of the following given equations. zuse the"X" and "Y" intersept method, and a check point. zuse the "x" value when solving for the checkpoint.

3x+2y=6 x-intercept (_,0)
y_intercept (0,_)
Checkpoint (1,_)
Click here to see answer by stanbon(75887)

Question 380875: how to solve this equation using substitution method? with checking.
1/x + 1/y=0
2/x + 5/y=-6

Click here to see answer by Fombitz(32388)

Question 381040: write an equation for each of the following statements and plot the graph of each equation. use the "X" and "Y" intercept method to plot the graph. a checkpoint is not reuired for this section. I really need someone to explain how I do this step by step. This is the statement:

The value of y is 3 less than two times the value of x.
Equation=___________________________________
x-intercept=(_,_)
y-intercept=(_,_)
Click here to see answer by stanbon(75887)

Question 381089: I need help to solve by substitution method for 6m+n=46, m-9n=81. Thanks!
Click here to see answer by stanbon(75887)

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