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

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Question 127897: 3x-y=6
Click here to see answer by jim_thompson5910(35256)

Question 127910: graph x=-3
Click here to see answer by jim_thompson5910(35256)

Question 127908: graph y=2/5x-3
2/5 means 2 over 5
Click here to see answer by jim_thompson5910(35256)

Question 127908: graph y=2/5x-3
2/5 means 2 over 5
Click here to see answer by stanbon(75887)

Question 127907: y=x-1
2x-y=0
Click here to see answer by jim_thompson5910(35256)

Question 127912: graph y=-x+3
Click here to see answer by jim_thompson5910(35256)

Question 127913: graph y=1.5x
Click here to see answer by jim_thompson5910(35256)

Question 127913: graph y=1.5x
Click here to see answer by stanbon(75887)

Question 127914: graph y-x=1
Click here to see answer by jim_thompson5910(35256)

Question 127906: graph 3x-y=6
Click here to see answer by jim_thompson5910(35256)

Question 127916: y=1/5x-1
1/5 means 1 over 5
Click here to see answer by jim_thompson5910(35256)

Question 128013: I am attempting to solve the following system, I tried Substitution and addition but I can't seem to make it work:
3y=2x
2x+9y=24
Click here to see answer by josmiceli(19441)

Question 127894: I am SO confused on this one, i already tried to solve this but when i checked by substittuting, they weren't equal.
Solving Systems by Substitution:
a = 2/b - 3
a = 2b - 18
I'm supposed to find the solution as a point like: [2,-4] but i have no idea if the a or b is x. Please help me with this!
I tried this: 2/b-3=2b-18 thats all i know that im pretty sure is right then times 2 on both sides -3=4b-18 then add 18 and -15=4b divide by 4 and thats 3.75 but when i put that into the other equation like 2*3.75 thats -10.5 and the final was -10.5 = 2/3.75 - 3 and thats -10.5 = .5 - 3 which is -10.5 does not equal -3.5 Im so confused and don't know what i did wrong!
THANK YOU SO MUCH
Click here to see answer by ankor@dixie-net.com(22740)

Question 128344: Solving a linear equation with several occurences of the veriable problem type 2
5x+7/3=1/3x-7/2. How can I solve this question
Click here to see answer by stanbon(75887)

Question 128354: 26. 10m-9n=15 27. 3c-7d= -3 28. 6g-8h=50 30. 3x= -31+2y
5m-4n=10 2c+6d= -34 4g+6h=22 5x+6y=23
Click here to see answer by jim_thompson5910(35256)

Question 128506: write each equation in slope intercept form. Then find the slope and the y-intercept of the line determined by the equation.
- 2 (x + 3y) = 5
Click here to see answer by josmiceli(19441)

Question 128505: write each equation in slope intercept form. Then find the slope and the y-intercept of the line determined by the equation.
- 2 (x + 3y) = 5
Click here to see answer by checkley71(8403)

Question 127782: find the slope of the line that passes through the given points
(3,f(3)) and (3+h,f(3+h))
Click here to see answer by solver91311(24713)

Question 128712: How Do You Fully Factorise y squared-7x+10?
I Have Gotten As Far As y squared -5x-2x+10
Click here to see answer by Earlsdon(6294)

Question 128751: Mary has a $90 gift certificate for a book store where paperbacks cost $9 and hardback books cost $12. She must spend at least $25 and no more than $90 to use the gift certificate. Write a system of inequalities to determine the formula for using the gift certificate.
I came up with 9x + 12y is less than or equal to 90; and 9x + 12y is greater than or equal to 25. Is that correct?

Click here to see answer by checkley71(8403)

Question 128898: without graphing, determine which of the following 3 points:
P1 = (8,6)
P2 = (2,5)
P3 = (4,1)
are part of the graph of the following system:
y - 10x <= 0
2y - 3x >= 0
y + x <= 15
Click here to see answer by solver91311(24713)

Question 128901: Transpose this augmented matrix:
[ 1 8 7 9 ]
[ 0 2 5 1 ]
[-4 -1 0 17]
Click here to see answer by solver91311(24713)

Question 128888: this is parallel to y=-3x+2, but passes through the point (1,-2)
Click here to see answer by checkley71(8403)

Question 128956: Is (-1,5)a solution of each system?explain.
x+y=4
x=-1
Click here to see answer by tutorcecilia(2152)

Question 128956: Is (-1,5)a solution of each system?explain.
x+y=4
x=-1
Click here to see answer by MathLover1(20850)

Question 129096: I hope I'm asking this question in the right section. It states to solve algebraically.
y = 1.2x - 32.7
y = 0.7x + 46.15
Thanks for your help!
Click here to see answer by stanbon(75887)

Question 129249:

x+y=14 x-y=20
Click here to see answer by checkley71(8403)

Question 129263: 6x+2y=-10
2x+2y=-10

Click here to see answer by checkley71(8403)

Question 129264: 6x+2y=-10
2x+2y=-10
Click here to see answer by checkley71(8403)

Question 129262:

4x+y=-9 4x+2y=-10
Click here to see answer by checkley71(8403)

Question 129475: the sun of two numbers is 20 their difference is 4
b. Solve by elimination to find the two numbers
Click here to see answer by idkweirdo(15)

Question 129540: solve for x
(9/4x)+(1/3)=(5/2x)
I don't even know where to begin
Click here to see answer by ilana(307)

Question 129570: I got stuck on this system problem. I always ended up with something odd like "-5" by itself. Help!
-3x + 3y = 4
-x + y = 3
Click here to see answer by jim_thompson5910(35256)

Question 129570: I got stuck on this system problem. I always ended up with something odd like "-5" by itself. Help!
-3x + 3y = 4
-x + y = 3
Click here to see answer by bucky(2189)

Question 129601: I don't understand how to work this problem which is on page 408 systems of linear equations by substitution the problems is y=3x x=3y
Click here to see answer by bucky(2189)

Question 129650: A goldsmith has two alloys that are different purities of gold. The first is three-fourthspure gold and the second is five-twelfths pure gold. How many ounces of each should be melted and mixed in order to obtain a 6-oz mixture that is two-thirds pure gold?
Click here to see answer by josmiceli(19441)

Question 129653: I need to write the slope-intercept form of the equation of the line that is perpendicular to 7x-8y= -2 and contains the point(6,3). I cannot get passed this step: y-3= -8/7(x-6), how do you multiply -8/7 * -6?
Click here to see answer by checkley71(8403)

Question 129682: I need help to solve this system using substitution

Click here to see answer by checkley71(8403)

Question 129649: The problem states that an employer has a daily payroll of $1225 when employing some workers at $80 per day and others at $85 per day. When the number of $80 workers is increased by 50% and the number of $85 workers is decreased by 1/5, the new daily payroll is $1540. How many were originally employed at each rate?
Click here to see answer by checkley71(8403)

Question 129700: 18. Education: A writing workshop enrolls novelists and poets in a ratio of 5 to 3. There are 24 people at the workshop. How many novelists are there? How many poets are there?
Click here to see answer by checkley71(8403)

Question 129725: Chemist must mix 30 % insecticide soln with 50% insecticide soln. (same insecticide) to obtain 200 L of a 42 % insecticide soln. Please help with 2 stage linear system of equation and demonstrate resolution. THX
Click here to see answer by checkley71(8403)

Question 129782: Mr.Lim buys 30kg of cheese at a certain price. She finds that if she had bought some cheaper cheese costing 95 cents less per kg , she could have had 32.5kg for the same amount of money . What is the price per kg of the cheese which is more expensive ?
Sir, help me Please
Click here to see answer by oscargut(2103)

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