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

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Question 762862: how can i solve the equations 72x+50y=9xy & 90x+70y=12xy

Click here to see answer by sachi(548)

Question 762650: if x+y=7*2 and xy =5*2 find x-y
Click here to see answer by tommyt3rd(5050)

Question 752016: Solve each system using substitution 2x = y-4 and -3y = x - 5

Click here to see answer by tommyt3rd(5050)

Question 755791: Solve each system by substitution
7x-4y=9
-3x+5y=-17
Click here to see answer by tommyt3rd(5050)

Question 763342: three circles are tangent externally.the distances between their centers are 23 inches,25 inches,20 inches.find their radii.
Click here to see answer by ramkikk66(644)

Question 763342: three circles are tangent externally.the distances between their centers are 23 inches,25 inches,20 inches.find their radii.
Click here to see answer by lwsshak3(11628)

Question 763351: solve 3x+3y+3z=0, -3x-3y-3z=0 and 3x+3y+3z=o
i have tried it but i am not getting the expected answer i,e. -1 1 0 please can you tell me the way to solve this
Click here to see answer by Alan3354(69443)

Question 764201: Assume that y varies directly as x. If y = -8 when x = -3, find x when y = 6. Leave your answer in fractional form
Click here to see answer by stanbon(75887)

Question 764327: Solve and graph linear inequalitie.
6x+3y>6
x−y<6
when I put in zero for x and y I get the points (0,2) and (1,0) and (0,-6) and (6,0), but this graphed ends up being wrong.
can someone please help me plot and graph this problem.-
thanks rich
Click here to see answer by stanbon(75887)

Question 764876: How to know if the equation given are dependent, consistent and inconsistent without solving. What is the pattern?
Click here to see answer by MathLover1(20850)

Question 764990: 2z = 3z
Click here to see answer by Tatiana_Stebko(1539)

Question 765094: (x + 3y) (x - 3y)
Click here to see answer by lenny460(1073)

Question 765228: 9x+6y+81
4x+3y=36
my answer is (9.0)
Click here to see answer by tommyt3rd(5050)

Question 765313: How do I find the solution set from y= x^2 - 22 and y = 4x - 1?
I don't know how to factoring x^2 - 22. As for the second linear I'm pretty sure it's (-1/4, -1)
Thank you
Click here to see answer by josgarithmetic(39617)

Question 765330: Help me solving a linear programs?
A tailor sews 2 kinds of shirt to be sold, the first kind needs 2 m of cotton and 4 m of silk, and the second kind needs 5 m of cotton and 3 m of silk. There are 70 m of cotton and 84 m of silk available. The first kind of shirt is sold at IDR 25,000.00 profit and the second shirt is sold at IDR 50,000.00 profit. To maximize his profit, he must sell?

Correct me if I'm wrong, the equations are;
For shirt A : 2x + 4y = 25000
For shirt B : 5x + 3y = 50000
And maximum profit function / f(x, y) is;
x + y ≤ 154
If it is so, after eliminating both equation I don't get square number, I got comas/decimal. Thus when I substitute to f(x,y) I don't get the answer.
Please advise me how to solve this. Sorry if I put this on wrong category.
Thanks :)
Click here to see answer by Theo(13342)

Question 765342: The length of a rectangle is 9 cm more than its width. The area of the rectangle is 136 cm^2. What are its dimensions?
Click here to see answer by Cromlix(4381)

Question 746529: -7x+y=-19
-2x+3y=-19
Click here to see answer by tommyt3rd(5050)

Question 732568: the equations are :
y=4x-2
y=x-2
what is the solution of the system of equations and is it consistent or not
I never learned this and i have to do an online course for keystone exams so i am really lost. Please help me

Click here to see answer by tommyt3rd(5050)

Question 732386: During the 1998-1999 Little League season, the Tigers played 48 games. They won 28
more games than they lost. How many games did they win that season?
Click here to see answer by tommyt3rd(5050)

Question 765759: What is the solution for y=117-x and y=24.5-x? Thank you
Click here to see answer by stanbon(75887)

Question 766025: Hello can you help me with this problem? It says you have to use the subsitution method to solve a system of equations that has three variables.
6x-4y+5z=31
5x+2y+2z=13
x+y+z=2
x=?
y=?
z=?
Click here to see answer by rothauserc(4718)

Question 766081: 4x+3y=1
x=1-y
Click here to see answer by mananth(16946)

Question 765722: solve the system below of linear equations. Verify your solution.
4x + 3y = 13
5x + y -8 = 0
Solve for X and Y.
Click here to see answer by suruman(21)

Question 766259: Write the equation in slope-intercept form of the line that has a slope of 2 and contains the point (3, 7).
Click here to see answer by ramkikk66(644)

Question 766257: Write the equation in slope-intercept form of the line that has a slope of 2 and contains the point (3, 7).
Click here to see answer by ramkikk66(644)

Question 766599: Use the elimination method to solve the system of equation that has four variables.
w+x-y+z=0
w-2x-2y-z=-5
w-3x-y+z=4
2w-x-y+3z=7
w=?
x=?
y=?
z=?
Click here to see answer by Alan3354(69443)

Question 766802: An army officer made the first part of a trip in a plane which flew at the rate of 300 miles an hour. At the landing field he was met by a car which took him the rest of the way to his destination at the rate of 55 miles an hour. the trip required 3 hours and 42 minutes. on his return trip the car traveled at the rate of 60 miles an hour and the plane which he took flew at the rate of 250 miles an hour. the return journey required 4 hours and 6 minutes. find the total distance that he flew and the total distance he traveled by car.
Click here to see answer by ankor@dixie-net.com(22740)

Question 767070: find all the value/s of k so that the system x+y=2 and x+(k^2 -3)y=k has
a) no solution
b) infinitely many solutions
c) a unique solution
Click here to see answer by solver91311(24713)

Question 767074: given the equation: y-2= -|x-3| + 1
A. sketch the graph of the equatiion. label three points on graph
b. find the x and y intercept of the graph
Click here to see answer by josgarithmetic(39617)

Question 767157: can you please help me solve this system of linear equations that has four variables by showing me the steps on how to do it.

w+x-y+z=0
w-2x-2y-z=-5
w-3x-y+z=4
2w-x-y+3z=7
Click here to see answer by Alan3354(69443)

Question 767158: w+x-y+z=0
w-2x-2y-z=-5
w-3x-y+z=4
2w-x-y+3z=7
find the four variables and please show work.
Click here to see answer by Alan3354(69443)

Question 767187: 3x^2+xy+3y^2=7; (1,1) Write the equation for the tangent line in slope-intercept form.
Click here to see answer by Alan3354(69443)

Question 767193: Find all the value/s of t such that the points A(t-1, 2t-1), B(4, 1-2t) and C( -3, 3t+5) lie on the same line
Click here to see answer by reviewermath(1029)

Question 767133: Write the equation of a line that is perpendicular to the given line and that passes through the given point.
y= 23x+9;(�6,5)

a. y=−23x+1 c. y=23x+9
b. y=−3x+3 d. y=−3x−4 222
Click here to see answer by mananth(16946)

Question 767198: can you help me solve this system of linear equations that has four variables by showing me the steps on how to do it with work too.
w+x-y+z=0
w-2x-2y-z=-5
w-3x-y+z=4
2w-x-y+3z=7

Click here to see answer by josgarithmetic(39617)

Question 767456: Given the following system of equations, identify the type of system.
x + y = 4
x - y = 6

Click here to see answer by tommyt3rd(5050)

Question 767565: Find the equation of the line passing through the point (1,8) such that this line, together with the +x and +y axis, forms a triangle whose height is twice its base
Click here to see answer by josgarithmetic(39617)

Question 767785: can u help me on all of the algebra 1 cause over the summer i been studying it to get it right but i cant

Click here to see answer by tommyt3rd(5050)

Question 768212: Graph each system. Tell whether each system has no solution, or infinitely many solutions.
x+2y=10
2x+4y=10
HELP!!!
Click here to see answer by tommyt3rd(5050)

Question 768212: Graph each system. Tell whether each system has no solution, or infinitely many solutions.
x+2y=10
2x+4y=10
HELP!!!
Click here to see answer by josmiceli(19441)

Question 768644: Solving linear systems in three variables by eliminating variables.
x+y+z=4
x-y+4z=18
2x+y+z=5
Click here to see answer by MathLover1(20850)

Question 768869: graph the system below and write the solution:
-2x+y=6
y=1/3x+1

Click here to see answer by oscargut(2103)

Question 768959: what is the equation in standard form of of a parallel line that passes through (0, -2)
on the parallel line find the orderd pair were x=-2

need help
Click here to see answer by lwsshak3(11628)

Question 768999: is the system inconsistent dependent or neither
x-y=2
4x=5y+7
Click here to see answer by Alan3354(69443)

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