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

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Question 570017: 0.5x+y=9
1.6x+0.2y=13
Can you show me the steps to solve this using elimination?
Click here to see answer by Alan3354(69443)

Question 569992: List all possible pairs of integers x and y such that the product of x and y equals the sum of x and y.
Click here to see answer by ankor@dixie-net.com(22740)

Question 570138: x+y=9
y=2x
Click here to see answer by Maths68(1474)

Question 570138: x+y=9
y=2x
Click here to see answer by sahnikdgp(1)

Question 570841: What is the x-coordinate of this solution?
2x+3y=-27
-3x+2y=23
My Work is Shown Below:
3(2x-3y=-27)
-3+2y=23
__________
6x-9y=81
-3x+2y=23
_________
-18x-7y=104
+18 +18
-7y=122
__ ___
-7 -7
y= -17.42
________________________________________________________________________________
Is that correct?
Click here to see answer by JBarnum(2146)

Question 571830: How can you use y=43+5x to solve 78=43+5x?
Click here to see answer by unlockmath(1688)

Question 572056: Find the equation of the line in standard form that passes through (-7,5) and is perpendicular to -4x+3y=13.
So far I have:
-4x+4x+3y=4x+13
3y/3=4x/3+13/3
y=4/3x+13/3.
Am I right at all? And if so, where do I go from here?
Click here to see answer by Theo(13342)

Question 572081: Using the equation -3x-y=6, find the slope of the line, the x-intercept of the line and the y-intercept of the line
Click here to see answer by nyc_function(2741)

Question 572586: solve by substitution method
5x+2y=-7
7x+3y=13
I am having an extremly hard time figuring this out PLEASE help
Click here to see answer by Alan3354(69443)

Question 572618: so im having problems in my algebra class, how would i do an equation like this ->
Choose the correct first step(s) to solve the system using elimination.
4x + 7y = 6 and 6x + y = 2
(example problem)
1)7(6x + y = 2) → -42x - 7y = -14
2)4x + 7y = 6x + y
3)y = -6x + 20 → 4x + 7(-6x + 20) = 6
4)(4x + 7y) + (6x + y) = 8
5)(4x + 7y) - (6x + y) = 4

Click here to see answer by scott8148(6628)

Question 572952: I am so confused on how your supposed to do this type of substitution problem.
y=-2x+6
3y-x+3=0
Click here to see answer by mathsmiles(68)

Question 572581: solve by the substitution method
4x-4y=0
7x+54=y
Click here to see answer by mathsmiles(68)

Question 572964: I am confused on how you go about solving this substitution problem
4y+3=3y+x
2x+4y=18
I started to try doing this problem several different ways but I'm not sure how to solve it. Here's how I attempted to do it.
4y+3=3y+x I started by subtracting ( swinging )
-4y -x -4y -x
= x-2=-1y
+2 +2
-1/2x -1=y
2x+4=18
2x+4( -1/2x-1)=18
2x+ -2x -4=18
0x-4=18
+4 +4
0x=22
Divide by 0 on each side.
X=0
-1/2(0)-1
(0,1)
Click here to see answer by mathsmiles(68)

Question 572584: I cannot get this please help
solve using the substitution method
4m+n=27
m-3n=23
Click here to see answer by mathsmiles(68)

Question 572454: 2x-8y=7
5x+4y=5
Click here to see answer by mathsmiles(68)

Question 572588: solve by elimination
6x-9y=13.5
7y-3x=-8
Click here to see answer by mathsmiles(68)

Question 572164: How do you solve this system by using the elimination method?
{2x-y=20
{3x+2y=-19
Click here to see answer by mathsmiles(68)

Question 572390: The graph of the system
y=2x+2
6x-3y=-6
consists of two lines that:
a. intersect at one point
b. do not intersect
c. are not in the same place
d. intersect in an infinite number of points
Click here to see answer by KMST(5328)

Question 573075: I tried doing this equations to solve for y and x.
3x - 10y = -25
5x - 20y = -55
Could you help me???

Click here to see answer by Alan3354(69443)

Question 573145: (5,1)is a solution to the equation 2x - 3y = 7. What does this mean?
Click here to see answer by solver91311(24713)

Question 573145: (5,1)is a solution to the equation 2x - 3y = 7. What does this mean?
Click here to see answer by mathsmiles(68)

Question 573065: Timmy has 14 math and science books. He has 5 times more math books than science books. Write a system of equations representing how many math and science books Timmy has.
Click here to see answer by mathsmiles(68)

Question 573171: Find the solution to each system by the addition (elimination)method. Check your answer.
4s - 5t = 18
6s + 10t = -8
Click here to see answer by oscargut(2103)

Question 573199: How can I draw x-2y-z=1 in 3d mode?
Click here to see answer by richard1234(7193)

Question 573703: Hello I would like to know a more in depth way of solving this problem
-3y= -2 - 7
-4x= -6y - 10.
I need to know how to solve it from beginning to end. please
Click here to see answer by checkley79(3341)

Question 574173: if you have spend $350 on equopement to clean offices. and for every office you spend $4.00 on supplies.. how many offices must I clean to come even if i charge $25 per office. I know i need a linear equation but i'm having problems creaing one. this is what i wrote 25x-4y=350. what am i doing wrong.
Click here to see answer by stanbon(75887)

Question 574304: what is 3x+3y=27

Click here to see answer by Alan3354(69443)

Question 574330: I am having touble getting this problem right, if you could please help and break down the steps, I get confused with fractions and dividing and multiplying them. Any help is appreciated thank you.
Solve the system by the elimination method.
5x+2y=-11
7x-3y=19
Click here to see answer by josmiceli(19441)

Question 574502: -30x-15_<-5(5x+7) how do you solve this
Click here to see answer by reviewermath(1029)

Question 574295: solve using the substitution method
-7x+y=47
7x+9y=3

Click here to see answer by jim_thompson5910(35256)

Question 574555: What are all ordered triples of numbers (x, y, z) which satisfy the system of equations
(x + y)(z + 1) = 24,
(x + y)(y + 1) = 24, and
(y + z)(x + 1) = 24?
Click here to see answer by KMST(5328)

Question 574805: Can you help me solve a system of linear equations
Click here to see answer by saifoo.khan(162)

Question 575282: Write the equation in standard form with integer coefficients.
y = -8/3x + 4/9
Click here to see answer by ankor@dixie-net.com(22740)

Question 575606: Consider the system
3x + ky = 0
2x + 2y = 0
Will the system have a unique solution when k is equal to 3 or when k is equal to any real number ?
Click here to see answer by Edwin McCravy(20055)

Question 575851: Suppose A is a 5 x 3 matrix, B is an r x s matrix and C is a 4 x 5 matrix. If At BC is defined, which one is true? ( the t after A means inverse)
1) the size of At BC is 3 x 5
2) r = 2, s = 5
3) r = 3, s = 4
4) r = 3, s = 5
Click here to see answer by jim_thompson5910(35256)

Question 575903: solve by substitution
x+y=5 and x=y+7
Click here to see answer by jim_thompson5910(35256)

Question 575901: Determine wether the systems are consistent or incosistent
y-2x=1
2x-3=y
Click here to see answer by jim_thompson5910(35256)

Question 576087: solve by substitution method for 8m+n=17 and m-9n=66
Click here to see answer by Maths68(1474)

Question 576156: Given the system of linear equations,(3x-4y=5 2x+3y=8)
Re-write both equations in the y = mx + b form.
What is the slope of the first equation? ��..
What is the slope of the second equation? ��
Based on the slopes, will these lines intersect or they are parallel?
��..

Click here to see answer by lwsshak3(11628)

Question 576191: Solve for C: 2cy - y = 2c - 1
Click here to see answer by nerdybill(7384)

Question 576155: A club offers single memberships, couple memberships, and family memberships. The club has sold a total of 1530 memberships. The couple memberships are 38 more than twice the single memberships. The family memberships are 8 less than three times the single ones.
Use s, c, and f to represent single, couple, and family memberships respectively and write a system of three equations that describes this problem.
Solve the system to find the number of memberships in each category.
Answer: the club has sold ��. single memberships, ��.. couple memberships, and ��. family memberships.

Click here to see answer by chana(69)

Question 576265: -41+9x=y
My work: Y= 9x+-41
I'm way off! Can you help me? I don't just want the answer but how to solve as well, urgent question.
Click here to see answer by Alan3354(69443)

Question 576265: -41+9x=y
My work: Y= 9x+-41
I'm way off! Can you help me? I don't just want the answer but how to solve as well, urgent question.
Click here to see answer by scott8148(6628)

Question 576512: use the substitution method to solve the linear system. x-y= -5 and x+4=16
Click here to see answer by stanbon(75887)

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