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

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Question 23518: why is the solver just addition? why isnt there a choice for subtraction
Click here to see answer by elima(1433)

Question 23624:
Click here to see answer by kviji_85(2)

Question 23624:
Click here to see answer by Earlsdon(4898)

Question 23704: How can i figure these linear equations out they are so confusing. For example, trying to find three ordered pairs, why three??
ex: y = 7- 4x
PLEASE HELP ME ASAP THANKS : )
Click here to see answer by rapaljer(3610)

Question 23679: write an equation of the line that passes through each point with the given slope.
(-3,-5),m=-5/3(5 over 3)
Click here to see answer by venugopalramana(3286)

Question 23661: what is the answer for these problems. Iam having diffcult with just these, please show work and use sub. or eilm. thanks.
1. x-9y=237
5x+3y=-267

2. x-4y=119
16y--432

3. 4x+5y=1
14x+5y=191

4. 8x+y=74
3x+19y=363

5.9x+17y=-475
7x+11y=-285

6. 9x+13y=536
9x+16y=587

7. 10x-y+-145
13x+3y=-339

8. 17x-8y+=154
17x-12y+=150

9. 11x-4y=364
2x-19y=322

10. x+2y=47
x-3y=7

11. 3x-4y=-198
x-3y=-111

12. 12x+13y=491
12x+19y=629

Click here to see answer by elima(1433)

Question 23716: Please solve by addition method:
3x - 4y = 9
-3x + 4y = 12
Click here to see answer by rapaljer(3610)

Question 23719: Please solve by addition method:
-3x + 2y = 8
3x + 2y = 8
Click here to see answer by Paul(988)

Question 23718: Please solve by addition method:
x - y = 3
-6x + 6y = 17
Click here to see answer by rapaljer(3610)

Question 23717: Please solve by addition method:
x - y = 3
-6x + 6y = 17
Click here to see answer by rapaljer(3610)

Question 23653: I am trying to solve a system by substitution. Can you please show me how to solve this?
27y = 3x + 3
5y - 4x = 8
Thank you,
Brandon
Click here to see answer by rapaljer(3610)

Question 23834: g-27=148

Click here to see answer by Alg.(2)

Question 23835: 24=h-53
Click here to see answer by Alg.(2)

Question 23785: I would like you opinion on which method would you prefer to use when solving systems of equations, elimination or substitution?
Click here to see answer by elima(1433)

Question 23832: a-4=-10
Click here to see answer by elima(1433)

Question 23833: m+54=36
Click here to see answer by elima(1433)

Question 24039: -y=-x+1
Click here to see answer by rapaljer(3610)

Question 23995: can u help me with this equation: -3(h-6)=5(2h+3)
Click here to see answer by yhtong(11)

Question 24007: 5x+6y=12 How do I solve this system of linear equation?
3x-2y=-4
Click here to see answer by venugopalramana(3286)

Question 23961: 2x-1=y
Click here to see answer by rapaljer(3610)

Question 24092: a boy has $350.00 in nickel and dimes in his pocket. if there are 45 coins, how many kind were there.
Click here to see answer by rapaljer(3610)

Question 24092: a boy has $350.00 in nickel and dimes in his pocket. if there are 45 coins, how many kind were there.
Click here to see answer by Paul(988)

Question 24091: (2a^3)^2+b+3b^2-a^6+4b-(b-b)+(2a-a^3)
Click here to see answer by rapaljer(3610)

Question 24090: (2a^3)^2+b+3b^2-a^6+4b-(b-b)+(2a-a^3
Click here to see answer by rapaljer(3610)

Question 24112: Please help me solve this equation: A=P(1+rt) solve for r
Please help me solve this equation: PV=nRT solve for T
Click here to see answer by rapaljer(3610)

Question 24112: Please help me solve this equation: A=P(1+rt) solve for r
Please help me solve this equation: PV=nRT solve for T
Click here to see answer by Earlsdon(4898)

Question 24151: ab=2/9ba, where a + b = 9
Click here to see answer by AnlytcPhil(958)

Question 24225: The combined age of two people is 91. Person A is twice as old as person
B was when Person A was as old as Person B is now. How old is each person?

Click here to see answer by AnlytcPhil(958)

Question 24233: 2x+3y=21
-3x-6y=-24
Click here to see answer by AnlytcPhil(958)

Question 24393: 9+11C<2(0.5C-5)
Click here to see answer by AnlytcPhil(958)

Question 24494: 5x-3y=-11
x-2y=2
Click here to see answer by elima(1433)

Question 24526: I am having trouble with this problem.
SOLVE THIS SYSTEM OF EQUATIONS, WHEN POSSIBLE...
x+y+z=4
x-y+2z=8
2x+y-z=3
I used the elimination method and broke this down into two equations with only two variables. I try to eliminate another variable, but cannot do it! HELP PLEASE!!
Click here to see answer by Earlsdon(4898)

Question 24552: Solve for x in the expression: - ( 1/x ) – 5 = 0; Show your recheck.
I'm not sure what to do with the -(1/x)?
Click here to see answer by Earlsdon(4898)

Question 24598: Would someone please tell me if this is correct?! Thank You!
9x^2-4y^2
Is this Prime Factorized???
Click here to see answer by Earlsdon(4898)

Question 24635: how do i do this problem?
Solve by graphing
{x+7=y
{-4+2=y
Click here to see answer by rapaljer(3610)

Question 24596: Here is the problem:
Factor polynomial completely.
250-16x^3
Thanks!
Click here to see answer by rapaljer(3610)

Question 24670: I have worked this problem about 5 times and the answers I get do not satisfy each equation. Could someone please tell me if this equation is inconsistent??
Solve this system of equations, when possible:
x-y+z=7
2x+5y-4z=2
-x+y-z=4
these are the answers I got, but do not satify each equation!
x=-4, y=-6, z=10
x=10, y=6, z=-3
I then multiplied 1)by -2 and 3)by 2 and added them seperatley to 2) and got answers of: 7y-6z=10 and 7y-6z=-12
I then subtracted them and got: 0=-2
which is and inconsistent system, right??!!
Thanks!
Click here to see answer by stanbon(26259)

Question 24713: I need help with a linear equation with variables on both sides.
Example:2p-9=5p+12
How would I do this?
Thank You,
Chris
Click here to see answer by algebrapro18(206)

Question 24726: solve algebraically for the value of x where these two lines cross:3y=21-6x and 3y=24-9x (show work)
Click here to see answer by rapaljer(3610)

Question 24802: 9-2m/7=19
Click here to see answer by chripchrip(6)

Question 24728: -6x+8y=-16
-2x-3y=-28
A system~I know that the answer is (8,4) but how do you get that?
Click here to see answer by elima(1433)

Question 24855: how can i solve this problem????
the length of a rectangle is 2 cm more than four times the width if the perimeter of the rectangle is 24 cm what are its dimensions?
Click here to see answer by rapaljer(3610)

Question 24861: i nead healp in this 2?????????
a rental car charges 15 $ per day plus 13 cents per mile to rent a certain car. another agency charges 19$ per day plus 19 cents per mile to rent the same car. how many miles will have to be drive for the cost of a car from the firs agency to equal the cost of a car from the second agency?( raound your answer to the nearlest hundrdth of a mile.) express the problems as a system of a linear equotion and solve using the method of your choice.
Click here to see answer by venugopalramana(3286)

Question 24930: the question is .. the book says write the equation in slope intercept form and standard form .. and the equation is y - 50 = 8 (x - 4 ) not for standard form i got 8x - y = - 18 .. but for slope intercept i dont understand how you do it .. i looked in to book for te answer and it was y = 8x + 18 .. i keep foing over it but i dont understand how they got that solution
Click here to see answer by smartypants(7)

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