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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 89175: I would appreciate any help with this. I don't know how to isolate the variable or which equation to work with first...
Solve:
5x-2y+2z=-24
x-3y-4z=33
3x+3y-2z=7

Click here to see answer by ankor@dixie-net.com(22740)

Question 89663: 6x-4y=10
2y+5=3x
Solve by using any method and I'm getting no solution and wanted to make sure.
Click here to see answer by scott8148(6628)

Question 90047: Write a system of linear equations, and then use the system to solve the problem.
A cup of uncooked rice contains 15 g of protein and 810 calories. A cup of uncooked soybeans contains 22.5 g of protein and 270 calories. How many cups each should be used for a meal containing 9.5 g of protein and 324 calories?
Click here to see answer by scott8148(6628)

Question 90067: Hello my friends. I need some help. How do youu solve the systems of linear equalities graphicall : 3x - y is less than or equal to six
x is greater than or equal to one.
y is less than or equal to 3
Thanks in advance!!
Click here to see answer by jim_thompson5910(35256)

Question 90089: My son needs help. A coffee merchant has coffee beans that sell at $9 per pound and $12 per pound. The two types are to be mmixed to create 100lb of a mixture that will sell for $11.25 per pound. How much of each type of bean should be used in the mixture
Click here to see answer by stanbon(75887)

Question 90139: Solve by graphing: x-y = 8
x+y = 2
This was so helpful we had to try again. Thank you

Click here to see answer by Earlsdon(6294)

Question 90205: solve by graphing
3x - 6y = 9
x - 2y = 3
Click here to see answer by jim_thompson5910(35256)

Question 90204: solve by graphing
x-2y = 8
3x - 2y = 12
Click here to see answer by jim_thompson5910(35256)

Question 90203: solve by graphing :
2x-y=4
2x-y=6
Click here to see answer by jim_thompson5910(35256)

Question 90078: Hello friends. I need some more help :(
Solve using substitution
4x - 12y = 5
-x + 3y = -1
Thanks
Click here to see answer by jim_thompson5910(35256)

Question 90362: One last question for the day. How would you solve the system by graphing
x+y=3 and x+y=-1
Click here to see answer by jim_thompson5910(35256)

Question 90361: I have a huge test coming up. I need some clarity. how would you rewrite the equation 2x-3y = -6 as a fraction of x? Do you just solve for x? Please show me. Thank you in advance!!
Click here to see answer by jim_thompson5910(35256)

Question 90359: I have a HUGE test coming up and I need some help. How do you graph the inequality 2x + 3y > 6
Thanks in advance.
Click here to see answer by jim_thompson5910(35256)

Question 90358: I have a BIG test and I need some help. Given f(x) = -5x-1, find f(a-1).
How do you solve this? Thanks in advance.
Click here to see answer by jim_thompson5910(35256)

Question 90455: solve by addition method:
x/3-y/2=-5/6
x/5-y/3=-3/5
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90454: solve by substitution method:
x=y+3
3x-2y=4
Click here to see answer by malakumar_kos@yahoo.com(315)

Question 90520: ziggys famous yogurt blends regular yogurt that is 3% fat with its non fat yogurt to obtain low fat yogurt that is 1% fat. How many pounds of regular yogurt how many pounds of non fat yogurt should be mixed to obtain 60 poinds of low fat yogurt.
Click here to see answer by checkley75(3666)

Question 90519: Tickets for a concert were sold to adults for $3.00 and to students for $2.00. If the total receipts were 824.00 and twice as many adult tickets as student tickets were sold, then how many of each were sold?
Click here to see answer by checkley75(3666)

Question 90518: donnie invested her $33,000 bonus and received a total of 970.00 in interest after one year. If part of the money returned 4% and the remainder 2.25%, then how much did she invest at each rate?
Click here to see answer by checkley75(3666)

Question 90560: My questions is what is the answer to :
If f(x) = -2x + 7, what is f(x+3)?
Thank you for your time...
Click here to see answer by scott8148(6628)

Question 90655: Sally bought three chocolate bars and a pack of gum and paid $1.75. Jake bought two chocolate bars and four packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum
Click here to see answer by checkley75(3666)

Question 90658: solve the system by addition or substitution 20x - 5y = -12
y = 4x +3
Thank you.
Click here to see answer by stanbon(75887)

Question 90659: Solve the system by graphing 4x + 4y = 4
x+y = 1
Thank you.
Click here to see answer by jim_thompson5910(35256)

Question 90657: solve the system by addition 2x + 4y = 3
4x -2y =1
Thank you in advance
Click here to see answer by jim_thompson5910(35256)

Question 90673: solve the system of linear inequalities by graphing
3x + 4y less then or eaqual to 12
x + 3y is leass then or equal to 16
x is greater than or equal to 0
y is greater then or equal to 0
Click here to see answer by jim_thompson5910(35256)

Question 90077: Solve by substitution. Please help.
8x-4y = 16
y = 2x -4
Thanks in advance.

Click here to see answer by bucky(2189)

Question 90807: what is algebra
Click here to see answer by praseenakos@yahoo.com(507)

Question 91051: I got this wrong, and the instructor did not explain why. Can you enlighten me?
There are 385 surfers at Surf City. 2/3 were boys and 1/12 were girls. If there are 2 girls for every boy, how many boys and how many girls are there in Surf City?
Click here to see answer by stanbon(75887)

Question 91052: I got this one wrong, can anyone enlighten me on how to do it?
A circus clown at the top of a 60 foot platform is playing catch with another clown on the ground. The clown on the platform drops a ball at the same time as the one on the ground tosses a ball upward at 80 ft/sec. For what length of time is the distance between the balls less than or equal to 10 feet?
Click here to see answer by kev82(151)

Question 91077: Graph using the intercept method: 2x - 5y = 10. Thanks in advance
Click here to see answer by jim_thompson5910(35256)

Question 91078: Tickets for and event cost $4 for children, $12 for adults, and $10 for senior citizens. The total ticket sales were $2160. There were 60 more adult tickets than child tickets, and the number of senior citizens tickets were 2 times the number of child tickets. How many of each tickets were sold? Thanks in advance
Click here to see answer by Earlsdon(6294)

Question 91141: I got this wrong, and the instructor did not explain why. Can you enlighten me?
There are 385 surfers at Surf City. 2/3 were boys and 1/12 were girls. If there are 2 girls for every boy, how many boys and how many girls are there in Surf City?
I got 385(.66) = 130.90
1/12(2)(385)=247
That only equals 377 in lieu of the 385
Click here to see answer by checkley71(8403)

Question 91050: I got this wrong, can someone help walk me through how these are done. I hate word problems. Missed 6 of them.
Combined population of City A and City b was 25,000 in 1990. By 1995, the population of city a increased 10% and city b increased 9%. Total population increased by 2380 people, so what was the population in 1990?
Click here to see answer by ankor@dixie-net.com(22740)

Question 91338: Are the sets of lines parallel, perpendicular, or neither:
Line 1 is through (-4,-7) and (1,3) and Line 2 is through (2,6) and (4,10)
Thanks in advance
Click here to see answer by Earlsdon(6294)

Question 91352: Line 1 is equation x - 4y = 12 and line 2 is equation 4x +y=4. Are they parallel perpendicular or neither.
Click here to see answer by tutor_paul(519)

Question 91350: Line 1 is through (9,2) and (3,-8) and Line 2 is through (-3,5) and (5,-1)
Are they perpendicular parallel or neither. Thanks in advance.
Click here to see answer by jim_thompson5910(35256)

Question 91447: rewrite the equation as a function of x 4x - 10y = 11. thank you
Click here to see answer by bucky(2189)

Question 91446: rewrite the equation as a function of x: -5x-6y=-12.Thank you
Click here to see answer by checkley71(8403)

Question 91455: solve by addition or substitution. 20x-5y=-12 and y = 4x+3. If anyone can help, I would be so grateful.
Click here to see answer by checkley71(8403)

Question 91454: My dear friends, if anyone can help I would be so grateful. Solve by substitution x+5y=0
-2x-4y=6
Thanks.
Click here to see answer by checkley71(8403)

Question 91453: Lane invested $14000 part at 15% and part at 2%. If the total interest at the end of the year is $1060 how much did she invest at 15%. My dear friends, if anyone can help I would be so grateful.
Click here to see answer by checkley71(8403)

Question 91445: write the equation of the line wuth x intercept (12,0) and y intercept (0,-2). Thank you.
Click here to see answer by checkley71(8403)

Question 91444: write the equations of the lines passing through (6,-10) and (6,-6). Thanks in advance. Thank you.
Click here to see answer by checkley71(8403)

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