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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 238509: solve by the substition method 9x+9y=-27 and -4x+y=22
Click here to see answer by Fombitz(13828)

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(57967)

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(31518)

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(15746)

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(12569)

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(3504)

Question 239095: solve by elimination method: 3x - 9y = 2 and 3x - 9y = 3
Click here to see answer by checkley77(12569)

Question 239095: solve by elimination method: 3x - 9y = 2 and 3x - 9y = 3
Click here to see answer by Alan3354(31518)

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(12569)

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(308)

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(15746)

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(12569)

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(31518)

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(12569)

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(31518)

Question 239642: Hi I need help with a math problem. The question asks: Use the graph to write the equation of the line in slope-intercept form. Then write that equation in standard form. the x and y intercept are both -2 and the slope is -1. Thanks
Click here to see answer by Alan3354(31518)

Question 239817: solve by addition
x-2y=-1
-x+5y=4

Click here to see answer by checkley77(12569)

Question 239785: Can you solve for x and y 8y=7+3x
Click here to see answer by checkley77(12569)

Question 240004: please help me solve this equation
n(n-3)<54
a)9 b)3 c)10
Click here to see answer by checkley77(12569)

Question 240071: Solve by graphing.
x=-y (can't figure out slope)
x+y=4
Can't figure out where the two points meet.
Click here to see answer by solver91311(17077)

Question 240096: a system of linear equations that has the point (4,-7) as it's solution???
Click here to see answer by solver91311(17077)

Question 240075: ok i need help with graphing slope and y-intercept the equation is y=3-2x
Click here to see answer by rfer(12730)

Question 240184: I need to solve for x and y by using substitution. I am not sure of how to go about doing this problem. If someone could help I would appreciate it. The problem is:
{y=8-3x
{2x-5y=11
I know that I need to multiply one problem to make the y's cancel but I am not sure.
Thanks
Click here to see answer by ankor@dixie-net.com(15746)

Question 240476: Factor(a+4)^2-2(a+4)+1
Click here to see answer by jim_thompson5910(28715)

Question 240568: y=x+2
y=-x+4
How Do You Solve This System?

Click here to see answer by jim_thompson5910(28715)

Question 240551: can you show me the correct formula for x+5y=13
-2x+4y=16
Click here to see answer by jim_thompson5910(28715)

Question 240611: How do you solve by elimination using multiplication:
-3x+4y=12
2x+y=-8
Click here to see answer by unlockmath(1614)

Question 240634: Solve.
(x+2)(x-11)(x+1)>0
The solution set is {x|___}
Click here to see answer by rapaljer(4667)

Question 240641: It's me again, I don't know how to solve the system of equations by substitution. {5x-2y= -1
{x+4y= 35
last question then I will leave you alone until next term in school.
Solve the inequality. Give the solution in interval form.

3(5x-1)-2x>13=7
Thank-you so much for your time and patience.
Click here to see answer by rapaljer(4667)

Question 240749: How do you Graph 5x+2y=4
Click here to see answer by solver91311(17077)

Question 240791: How do you write an equation for a line that is parallel to a given line and passes through a given point
(1,3) y=-4x+5
Click here to see answer by vleith(2825)

Question 240875: i solved this problem and i keep coming up with decimal answers, i am stuck please help....
"solving system of linear equation by elimination"
problem( x+y=-16)
3x+y=-30
Click here to see answer by Alan3354(31518)

Question 240926: i need help on solving for elmination, i get confused.
Problem: 2x+6y=17
2x-10y=9
break it down for me step by step, if you can..thank you! :)
Click here to see answer by edjones(7569)

Question 241002: When you solve a system of equations by the addition method, how do you determine whether the system of equations is inconsistent?
Click here to see answer by stanbon(57967)

Question 241093: what is the answer and explation of x=6y-4,x=-2y+28
Click here to see answer by unlockmath(1614)

Question 241239: Write the slope-intercept form of the equation for the line.

Click here to see answer by checkley77(12569)

Question 241239: Write the slope-intercept form of the equation for the line.

Click here to see answer by College Student(505)

Question 240390: This is a textbook problem: which values in the table is the relationship linear? Tell how you decided. Write the equation for each linear relationship.
__________________________________________________________
x 5 10 15 20 25 30
__________________________________________________________
y 20 30 40 50 50 50
??? I first began by attempting to create an equation that would equal such as y=3(x)+5; this would make sense for (5,20) but not for the others
??? then I considered beginning by using the equation of a straight line y=mx+b; but if I plug in Im still not sure if it would equal???
Click here to see answer by Alan3354(31518)

Question 241421: Solve the system of equations.
x + 5y = 2
-6x + 5y = -47
Click here to see answer by jim_thompson5910(28715)

Question 241439: Find the soultion to the system of equations.
x + 7y = -2
3x + y = 34
Click here to see answer by checkley77(12569)

Question 241438: Find the soultion to the system of equations.
4x + 1 over 2y = -12
3x + 2y = 4
Click here to see answer by checkley77(12569)

Question 241396: 4x-5y=11
x+2y=7
Click here to see answer by checkley77(12569)

Question 241488: (5/x)-(2/y)=7
write in standard form
Click here to see answer by stanbon(57967)

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