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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 236364: 2x + 4y =10
3x - 2y = -9

Click here to see answer by checkley77(12844)

Question 236363: 2x + 4y =10
3x - 2y = -9

Click here to see answer by checkley77(12844)

Question 236583: solve the system by the elimination method: x+9y=66 and -x+9y=60
Click here to see answer by jim_thompson5910(35256)

Question 236841: -x+2y=16
x-3y=-21
Click here to see answer by jim_thompson5910(35256)

Question 236954: My son has this math problem and I don't remember for the life of me how to do this. Could you show how to get the answer, so I can help him with others.
3x - 4y = 5
6x - 8y = -5
Click here to see answer by edjones(8007)

Question 237005: find two numbers whose sum is 49 with a diffence of 1.
Click here to see answer by solver91311(24713)

Question 237138: How do you solve a system of linear equations if one of the sets only has and x and y, no answer?
Example:
5x -7y = 2
3x = 4y
Click here to see answer by rfer(16322)

Question 237111: y+2=5/3(x+6)
Click here to see answer by cowgirl30(8)

Question 237263: What are the basic algebra equation rules for multiplication and division? I have the folllowing equation: CPI=EV/AC is the earned value equation, with the following information provided: .92= 172,500/AC
How do you isolate AC, when it is the denominator and get the other numbers on the other side for the answer?
Click here to see answer by Theo(13342)

Question 237246: find the general solution for x(n)and y(n)for x(0)=1 and y(0)=0,
x(n+1)=x(n)+2y(n)
x(n+1)=3x(n)+2y(n) n=0,1,2,3,...

Click here to see answer by rapaljer(4671)

Question 237212: I am not really understanding how to do this,
I need to evaluate each of the functions below at x= 1,2,4,8, and 16. Plot the graph of each function. Classify as linear, quadratic, polynomial, exponential or logarithmic and explain the reasons for your classifications.

f(x) = 3x - 2
Click here to see answer by Alan3354(69443)

Question 237302: can you show me the linear equation demonstrating 3 per day for 10 years?
Click here to see answer by rapaljer(4671)

Question 237464: How do you graph this pair of points and what is the slope
(2,3)(-5,-3)
How do you graph this equation and what is the y-intercept?
y+x=-7
Can you help me to solve this equation
8x-(4x+6)=14
the solution is x=
Click here to see answer by checkley77(12844)

Question 237533: this is a "solving systems of equations using substitution" question. I tried to solve it using a negative and a positive number but i cant. i've been stuck on this question for 30 minutes. Please help me as soon as possible.
2x-3y=6
x+y=12
*when you solve x+y=12, does it become y=x-12 or y=x+12?
*also, when you plug in for y ---> 2x-3(x-12)=6, does it become 2x-3x+12=6 or 2x-3x-12=6 or 2x+3x+12=6 or 2x+3x-12=6?
Click here to see answer by stanbon(75887)

Question 237650: Graph equation. Plot at least five pont for equation.
x-2y=6
Click here to see answer by College Student(505)

Question 237712: help solve 2x=-x+9
Click here to see answer by College Student(505)

Question 236779: Solve for X and Y
X + Y=7 , X + 2Y = 11
Click here to see answer by College Student(505)

Question 237288: If gas is at $3.99/gallon and I buy 15 gallons, what would the cost be?. If I buy 5/gallons at $3.99, what would the cost will be ?

Click here to see answer by College Student(505)

Question 238140: 4y-3x=12 y+2x=-8
Click here to see answer by checkley77(12844)

Question 238139: 2x+y=3 3y=x-12
Click here to see answer by checkley77(12844)

Question 238137: x=y=6 3y-x=6
Click here to see answer by checkley77(12844)

Question 238226: 22x=57=12y-18
Click here to see answer by checkley77(12844)

Question 238306: how can you solve the problem (8,3) m=4 and make it to standard form
Click here to see answer by solver91311(24713)

Question 238284: Hi, I need help with another problem. The question is: Is f(4) a zero of the function: f(x)=3x-12? why or why not. How would I figure that out and what is a zero of a function? Thank you!
Click here to see answer by Alan3354(69443)

Question 238366: Solve this system by the addition method:
x/4 + y/3 =5
x - y =6

Click here to see answer by stanbon(75887)

Question 238470: x + y + z = 9
x + 2y + 3z = 23
x + 5y -3Z = -7
Click here to see answer by Fombitz(32388)

Question 238492: 4x + 5y = 51
4x - 5y = 21
Click here to see answer by Fombitz(32388)

Question 238509: solve by the substition method 9x+9y=-27 and -4x+y=22
Click here to see answer by Fombitz(32388)

Question 238626: Solve the system by the elimination method.
5x + 5y = -13
7x - 3y = 19
I'm having a hard time understading this equation.
Click here to see answer by stanbon(75887)

Question 238626: Solve the system by the elimination method.
5x + 5y = -13
7x - 3y = 19
I'm having a hard time understading this equation.
Click here to see answer by Alan3354(69443)

Question 238703: can someone please show me how to solve this step by step? I need to simplify this.
7{[4(a-4)+16] - [2(3a-2)+2]}
Click here to see answer by ankor@dixie-net.com(22740)

Question 238838: Solve for X and Y in the following problems using either substitution or elimination methods. Make sure you show all your work so you can get partial credit even if your final answer is wrong.
a. X + Y= 6 , 2X + Y = 8
b. 7X + 3Y = 14 , 5X + 9Y = 10
c. 4X + Y = 16 , 2X + 3Y = 24
d. 12X + Y = 25 , 8X - 2Y = 14

Click here to see answer by checkley77(12844)

Question 238242: x=3y
Click here to see answer by College Student(505)

Question 239045: Okay, i kinda asked a question like this earlier but i forgot one thing.
A chart shows ideal heights and weights for adults with a medium build. A person with the height of 6o inches should have a weight of 112 pounds and a person with the height of 66 inches should have a weight of 136.
Write a linear equation to estimate the weight of a person of any height.
HOW DO I DO THAT?

Click here to see answer by Theo(13342)

Question 239095: solve by elimination method: 3x - 9y = 2 and 3x - 9y = 3
Click here to see answer by checkley77(12844)

Question 239095: solve by elimination method: 3x - 9y = 2 and 3x - 9y = 3
Click here to see answer by Alan3354(69443)

Question 239149: can you show me how to do this: dirct variation equations
X 1 2 3 4 6
Y 5 10 15 20 30
For the formula of y=ax

Click here to see answer by checkley77(12844)

Question 239420: What is five divided by the sum of a number and 3, minus the quotient of 3 and the difference of the number and 3 is equal to 6 times the reciprocal of the difference of the number squared and 9. What is the number?
Click here to see answer by JimboP1977(311)

Question 239421: One conveyor belt can move 1000 boxes in 12 minutes. Another can move 1000 boxes in 10 minutes. If another conveyor belt is added and all three are used, the boxes are moved in 3 minutes. How long would it take the third conveyor belt alone to do the same job?
Click here to see answer by ankor@dixie-net.com(22740)

Question 239550: There are 174 words typed in 3 minutes. There were 348 words typed in 6 minutes. How many words will be typed in 8 minutes?
Click here to see answer by checkley77(12844)

Question 239526: Solve for X, Y, and Z in the following systems of three equations using either substition or elimination methods:
a. X + 2Y + Z = 6
X + Y = 4
3X + Y + Z = 8
b. 10X + Y + Z = 12
8X + 2Y +Z = 11
20X - 10Y - 2Z = 8
c. 22X + 5Y + 7Z = 12
10X + 3Y + 2Z = 5
9X + 2Y + 12Z = 14

Click here to see answer by Alan3354(69443)

Question 239549: The cost of producing 4 units is $204.80. The cost of producing 8 units is $209.60. How much does it cost to produce 12 units?
Click here to see answer by checkley77(12844)

Question 239634: my son just cant understand algebra so is there aq book or something that could show him step by step to solve a problem
Click here to see answer by Alan3354(69443)

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