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

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Question 506413: solving the equation 16x^2-1=0
Click here to see answer by xdragonfight(116)

Question 506691: Help please! How do I solve by elimination:
x-2y = -14 and 3x + 2y = 6
Click here to see answer by jennywecas(28)

Question 506694: Thanks so much for helping. How do I solve by elimination:
y = -3x + 1 and 3x + y = -1
Click here to see answer by jennywecas(28)

Question 506696: Please help!
I have to solve these equations by elimination:
#1 2x + 3y = 12 and y = 4/3x -2
#2 y = 1/2 x + 2 and y = 2x -1
Click here to see answer by jennywecas(28)

Question 506908: Evaluate: x^2-5x+3 for x=-5
Click here to see answer by jim_thompson5910(28504)

Question 506931: solve system of equation.
x+2y+z=4
2x+y-z=-1
x-y-z=-2
Click here to see answer by jim_thompson5910(28504)

Question 507198: solve the following equations for x and y by elimination
3x + 3y=0
2x - 2y=8
Click here to see answer by jennywecas(28)

Question 507375: Hi there,
This is my question: State how many solutions exist for each set of equations and state whether the lines are consistent or inconsistent and independent or dependent:
1) A)6x-2y=2
9x-3y=1
I have made it this far in solving the problem, but do not get what I am doing wrong:
-- 9x-3y=1=>9x=1+3y
-- 6x-2y=2 => 15(1+3y)-2y =2
-- 15+45Y-2y=2
-- 43/43y = -13/43
-- Y = ??
I understand that you must use substitution, for example if it were x+y=9 then it would be x=9-y. However I've only ever done it with just a singe Variable. I do not know what to do since this question has a "9x"... do I add the "9x" to the 6x? creating 15x? I hope you understand and see where I went wrong. Thank you in advance for answering my question.

Click here to see answer by scott8148(6628)

Question 507436: Determine the value of k for which the system of linear equations has no solution.
4x - y = -16
16x + ky = 11

Click here to see answer by ankor@dixie-net.com(15638)

Question 507470: x=y,2x + 2y =120

Please help mee
Thanks in advance!:)
Click here to see answer by jim_thompson5910(28504)

Question 507468: by substitution:
1. y=3x
y-x=30
2. x=y
2x+2y=120

Please help meeee. :)

Click here to see answer by jim_thompson5910(28504)

Question 507642: -10=xy+z for x
Click here to see answer by Fombitz(13828)

Question 507422: Pure acid is to be added to a 10% acid solution to obtain 54L of a 20% acid solution. What amount of each should be used?
Click here to see answer by ankor@dixie-net.com(15638)

Question 507933: how do i put 5-y = -3x into standard form (ax+ by= c)
Click here to see answer by jim_thompson5910(28504)

Question 508070: 15x = 5y + 20 Write the equation of the line in slope-intercept form and identify the slope.

Click here to see answer by stanbon(57246)

Question 508076: -8x + 8y = -10 Write the equation of the line in slope-intercept form and identify the slope.

Click here to see answer by stanbon(57246)

Question 508201: solve by the elimination method
3x-2y=7
-x+5y=2
Click here to see answer by oberobic(2304)

Question 507952: i'm having trouble putting this into an equation, thank you in advance!! i really need help...
In 1962, Wilt Chamberlain set an NBA single-game scoring record. He scored 64 times for a total of 100 points. He made no 3-point shots, but he made several free throws worth 1 point each and several regular shots worth 2 points each. how many free throws did he make? How many 2-point shots did he make?
Click here to see answer by ankor@dixie-net.com(15638)

Question 508357: Can you please help me solve this one...
Find the x and y intercepts of this equation: -7x + -3y = -21
Click here to see answer by mananth(12270)

Question 508369: Solve the equations using elimination & substitution method :
Please show the complete solution.Thank You. Urgent here. Please.Thanks again .
5x-2y=20
x+3y=-10
Click here to see answer by Maths68(1474)

Question 508398: The dosage of a medicine ordered by a doctor is 40 mL of a 16% solution. A nurse has available both a 20% solution and a 4% solution of this medicine. How many milliliters of each could be mixed to prepare this 40-mL dosage?
Click here to see answer by Maths68(1474)

Question 508747: Hello could I get some help on solving 5-11/x+2=3 and what property do I use if you could show me the steps on how to do it it would be tremendous help. Thanks!
Click here to see answer by jerryguo41(162)

Question 508961: how do you put 1/6x-1/15y=-1/3 in y=mx+b format?
Click here to see answer by mananth(12270)

Question 508960: how do you put 1/2x-1/5=-1 in y=mx+b format?

Click here to see answer by Theo(3458)

Question 509092: Solve for x and y
2x + 2y=8
6x - y=10
Click here to see answer by mananth(12270)

Question 509304: hey can you guys help me with this question pleasee(: i need help i gotta solve the linear systym usingg the substitution method... y=3x+2 x+2y=11
Click here to see answer by stanbon(57246)

Question 509433: Cpuld you help me with naming the point on the line when the point-slope form is: y=7-2(x-3)?
Your help is greatly appreciated!
P.S. I got (-5,7) and it was incorrect.
Click here to see answer by richard1234(5390)

Question 509489: -8+3h=1
Click here to see answer by codyred2(1)

Question 509489: -8+3h=1
Click here to see answer by solver91311(16868)

Question 509582: 3n-2 Divided by 5=7/10
Click here to see answer by edjones(7569)

Question 509582: 3n-2 Divided by 5=7/10
Click here to see answer by oberobic(2304)

Question 509611: y=x(ab/a-b) solve for a
Click here to see answer by edjones(7569)

Question 509938: how can i solve for "a"? (5a-3(4-a))/2=5
Click here to see answer by rfer(12647)

Question 510319: Algebra Question...a car dealership sells cars and trucks in a ratio of 7 to 5. Last month the dealership sold 84 cars and trucks. How many cars and how many trucks were sold?
Need 2 equations...
Click here to see answer by rfer(12647)

Question 510724: Please!!! I keep getting 3 different answers. can you please help me break this down
[7(x+5)-19] - [4(x-6)+10]=
Click here to see answer by Alan3354(30983)

Question 510724: Please!!! I keep getting 3 different answers. can you please help me break this down
[7(x+5)-19] - [4(x-6)+10]=
Click here to see answer by rfer(12647)

Question 510874: y=3/8x+5 in standard form
I'm a bit confused as to how to solve.
I attempted and received 3x+y=5 as an answer. Although,Im not sure if this is correct
Thanks for the help.

Click here to see answer by rfer(12647)

Question 510946: Please help me solve this equation:
Click here to see answer by oberobic(2304)

Question 510946: Please help me solve this equation:
Click here to see answer by stanbon(57246)

Question 510991: How do i use linear combinations to solve the
system of this linear equation
2a+6z=4
3a-7z=6
Click here to see answer by stanbon(57246)

Question 511173: 1. x-y=5
2x-5y=5
2. x-y=0
2x+3y=35
3. x-2y=6
3x-2y=2
4. y=2x-3
y=3x-3
Can u gimme the answer of this through substitution method.?
Thanks in Advance.~
Click here to see answer by solver91311(16868)

Question 511175: By graphing,:
1. y-2x=0
x+y=3
2. 2x-y=1
x+2y=-2
3.2x-6=3y
y+2=2/3x
4. 1/2x +y =4
x+2y=8
Can u solve this one.?
thanks in advance.!
Click here to see answer by solver91311(16868)

Question 511205: 5≤ 1/x-9 ≤-3
can some one help me solve this?

Click here to see answer by stanbon(57246)

Question 511243: Using the elimination method, how do I solve this problem: x/2+y/3=-3; x/2+2y=-8. I have tried to use the regular elimination method by adding down the columns, but fractions confuse me so I keep getting the answer wrong. Please help.
Click here to see answer by solver91311(16868)

Question 511503: what is the x-intercept and the y-intercept of the graph of 6x + 3y = 54

Click here to see answer by oberobic(2304)

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