# Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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 Algebra: Expressions involving variables, substitution Solvers Lessons Answers archive Quiz In Depth

 Question 21831: a^3b^3c^3 - a^2b^3c^4+a^3b^2c^4 Click here to see answer by dkspoet(13)

 Question 20929: if (a+b)/a = 6 and (b+c)/c = 9, compute the numerical value of a/c Click here to see answer by venugopalramana(3286)

 Question 23396: Factor this expression K^2-6K+9 Click here to see answer by elima(1433)

 Question 23443: solve this pair of equations by substitution 4x+y=-19 7x-y=8 Click here to see answer by rapaljer(4667)

 Question 23447: This is regarding Simplification involving Addition & Subtraction: The Problem is: -(4-5a)-(-2+3a) My answer I get is: -6-8a (Is this correct?) It isn't working for me. Thanks Click here to see answer by rapaljer(4667)

 Question 23451: This is regarding Simplification involving Addition & Subtraction: Problem: (3f-f^2+fg)-(f-3f^2-2fg) My answer is: 2f+2f^2+3fg (Is this correct?) Click here to see answer by rapaljer(4667)

 Question 23460: Assume that y varies inversely as x.If y=8 when x =2.5,find x when y=2. Click here to see answer by Earlsdon(6294)

 Question 23497: I need to solve for x in the equation nx=2nx-21n could you please help me. I have tried this way-- nx=2nx-21n nx=n(2x-21) where do I go from here? Thank you Click here to see answer by longjonsilver(2297)

 Question 23496: 7-2x=x-14 Click here to see answer by elima(1433)

 Question 23510: If a over x plus one equals c over x, which is an expression for x in terms of c and a? Click here to see answer by longjonsilver(2297)

 Question 23511: a) Solve for x and express the answer in radical form 1 over x + 1 equals x - 4 B) Between which two consectutive integers does the positive root of this equation lie? Click here to see answer by longjonsilver(2297)

 Question 23533: Solve the System by Substitution: y=x+4 3x+y=16 Click here to see answer by rapaljer(4667)

 Question 23535: Solve the system by substitution 4x+3y=30 y=2x Click here to see answer by rapaljer(4667)

 Question 23536: x+y=1 2x-3y=? Click here to see answer by rapaljer(4667)

 Question 23499: -2x+3y=14 x+2y=7 Click here to see answer by ilana(307)

 Question 23596: simplify each expression 7x - 5y - 4x + 3y Click here to see answer by ilana(307)

 Question 23592: y=3(t-s);s Click here to see answer by ilana(307)

 Question 23615: Simplify: (4x-5) + (9x+14) Click here to see answer by MathNerdette(3)

 Question 23545: Solve the system by substitution x-7y=-22 5x+2y=1 Thanks Click here to see answer by elima(1433)

 Question 23642: I'm pretty sure this would be considered as an expression involving variables,etc. I have gotten many of these problems but still do not seem do understand or do it corretly. Please help. Here is my question: If --- n=6 1<=n<=10 (IN OTHER WORDS: 1 is less than or equal to n, which is less than or equal to 10.) How would you solve this?! Click here to see answer by elima(1433)

 Question 23590: ax+by=c;y Click here to see answer by rapaljer(4667)

 Question 23591: 5x-2y=-6;y Click here to see answer by rapaljer(4667)

 Question 23686: solve the system by substitution 6(x+2)-y=31 5x-2(y-3)=23 Click here to see answer by longjonsilver(2297)

 Question 23685: solve the system by substitution 2(x+3)-y=7 7x-3(y-1)=9 Click here to see answer by longjonsilver(2297)

 Question 23651: y=1/2x +4 2y+2x=2 Click here to see answer by elima(1433)

 Question 23928: 7x+3=15x+9 Click here to see answer by Sridi(6)

 Question 23940: x= -3, y= -1, z= -1 <-----------key x^2 - 3yz + 4 Click here to see answer by longjonsilver(2297)

 Question 23962: Use substitution to solve each system of equations. X=2Y Y=X-2 Thanks in advanced!!! Click here to see answer by smallfry(7)
 Question 23962: Use substitution to solve each system of equations. X=2Y Y=X-2 Thanks in advanced!!! Click here to see answer by elima(1433)

 Question 24026: If Kelly bought 3 pens and 4 pencils that cost 7.42 and Bill bought 4 pens and 5 pencils that cost 9.62 what is the cost of one pen and one pencil Click here to see answer by rapaljer(4667)

 Question 24001: Rewrite the equation so that the y is a function of x 2x=-3y+10 Click here to see answer by longjonsilver(2297)

 Question 23976: (7(8-2)+9) - (13-2)(11-6)/1) 6 + 9 11 5 7 x 15 55/1 105 55 Please help, I do not understand where to start. Click here to see answer by queenofit(120)

 Question 23966: Systems of Equations X+Y=16 2Y=-2X+2 please and thanks Click here to see answer by rapaljer(4667)

 Question 24087: 3x-y=11 x+2y=-36 Click here to see answer by rapaljer(4667)

 Question 24086: 3x-y=11 x+2y=-36 Click here to see answer by rapaljer(4667)

 Question 24094: A number 2 cubed? Click here to see answer by rapaljer(4667)

 Question 24093: a number decreased by 7? Click here to see answer by rapaljer(4667)

 Question 24114: 2x-3y =9 -5x-3y = 30 i know how to solve for x but not for y can u explain how to bring the x back into the equation to get y Click here to see answer by rapaljer(4667)

 Question 24117: P=4s Solve for s Click here to see answer by rapaljer(4667)

 Question 24138: 4=0.4(3D-5) Click here to see answer by queenofit(120)

 Question 24171: what is 7a-2=1 what is a? Click here to see answer by Earlsdon(6294)

 Question 24125: m=(a+b)/2 Solving for a Click here to see answer by elima(1433)

 Question 24184: I am helping a brother with his homework. How would you work this out?? (4n+5)x5=-n-24 Click here to see answer by elima(1433)

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