# 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 6161: This question is also on elimination... 3x+4y=19 3x+6y=33 My answers were (7,-1/2) Now, i'm having the same problem that i had with the last one. The 7 checks, but the -1/2 doesn't. Any suggestions on this one? Thanks Click here to see answer by glabow(165)

 Question 6173: I am having trouble understanding how the answer was arived at on the following problem: 5X^2Y^2Z^3-X^2Y WHERE X=-2, Y=5, Z=-1 Here is my work 5*-2^2*5^2*-1^3--2^2*5 =500 - (-)20 =520 The answer from my test was -520. How is this negative? Click here to see answer by ichudov(499)
 Question 6173: I am having trouble understanding how the answer was arived at on the following problem: 5X^2Y^2Z^3-X^2Y WHERE X=-2, Y=5, Z=-1 Here is my work 5*-2^2*5^2*-1^3--2^2*5 =500 - (-)20 =520 The answer from my test was -520. How is this negative? Click here to see answer by guapa(62)

 Question 6202: This is on elimination.. i hope you can help me. 3x+y=1 5x-y=1 Now, my answer was (1/8,5/8) I checked this, and the 1/8 checks, but the 5/8 doesn't. Click here to see answer by jst_kidding(6)

 Question 6160: This is on elimination. 3x+y=1 5x-y=1 I already solved this, and got (1/8, 5/8) Now, the 1/8 checks, but the 5/8 doesn't check. Any suggestions? Click here to see answer by arunpaul(104)

 Question 6266: This is on elimination. 3x+y=1 5x-y=1 I just asked this question, and the answers that you gave me were (1/4,-3/4) And the 1/4 checks, but the -3/4 doesn't check... So now i'm really confused, because this doesn't seem right.. Click here to see answer by jst_kidding(6)

 Question 5648: My problem says: find the equation of the line parallel to the graph of 4x+2y=8 and containing(-1,5) I think that the answer is y=2x+7 Is this right? Thanks for helping me! Click here to see answer by ichudov(499)

 Question 6538: I=Prt Solve for r I think that it is I/Pt=Prt/Pt I/Pt=r Click here to see answer by Mike(39)

 Question 6678: If the system 2x-5y=1 and -3x+7y=-3 is to be solved by elimination of x, and the first equation is multiplied by 3, then by which number should the second equation be multiplied? *I think that the answer is 2.Is this correct? Click here to see answer by xcentaur(357)
 Question 6678: If the system 2x-5y=1 and -3x+7y=-3 is to be solved by elimination of x, and the first equation is multiplied by 3, then by which number should the second equation be multiplied? *I think that the answer is 2.Is this correct? Click here to see answer by ichudov(499)

 Question 6362: How do you know when to combine like terms?Why do we use like terms to add and subtract? Thanks Click here to see answer by prince_abubu(198)

 Question 6712: The price of gasoline has increased by 5% during the past month, if the price per gallon a month ago was a \$1.20 what is the current price per gallon now Click here to see answer by prince_abubu(198)

 Question 6711: if 5 x 10n = 0.005, then n= Click here to see answer by Mike(39)

 Question 6794: I am having a real hard time with algebra and need help with the following problem: Find the equation for the line that passes through the indicated pair of points (-2,-2)and(7,25) Thanks for being there when needed Click here to see answer by prabhjyot(164)

 Question 6159: My question says to solve the system of inequalities by graphing... and i have 10 questions on this, and no idea how to do it...So could you show me one? y y>-x+5 On other questions there are lines under some of the <,> signs... what does this mean, and how does this change the problem? Thanks Click here to see answer by sslitten(5)

 Question 6915: Hi, I really need some help with my daughters homework. I have been away from alegbra for quite some time. Here is her problem. A person has \$100.00 to purchase 100 animals. Those animals are Horses for \$10.00 each, Goats for \$1.00 each, and Ducks 8 for \$1.00. What formula would I use to solve this problem? I really need your help. Thank you so much. Click here to see answer by glabow(165)

 Question 6947: Please help me evaluate this expression when x= -2 and y= 3. 2(x-y)^2 I did this two different ways and one time i got -10 and the other time i got 50. i don't know which to distribute first, the 2 or the exponent. thanks! Click here to see answer by longjonsilver(2297)

 Question 7013: The question is 4x^2 - 20 = 5. I know that I have done these recently but I am drawing a blank. Click here to see answer by longjonsilver(2297)

 Question 7116: Please help me simplify this expression -96x+9 over -3 or -96x+9/-3 or -96x+9 ________ -3 i gave you three examples because i wanted you to understand what type of problem i need you to solve. =) THANKS Click here to see answer by Earlsdon(6294)

 Question 7283: Directions-- Simplify. -1/2 - 2/3 -6.2 + 4.6 (-5)(7)(-3) (-3)(-4) 56a - (-8) I would just like to know the steps to solve these problems. I have totally forgotten how to do it... if you can help I'd appreciate it! Thanks! Click here to see answer by bonster(299)

 Question 7281: The directions are... Simplify each expression. these are a few of the problems... 5(r+2)+7r 10c+5c+6+d+d What steps do I need to do? How do I solve this thing?! Click here to see answer by bonster(299)

 Question 7382: 4(11+7)-9x8= i need help and can you explain it to me thank you Click here to see answer by bonster(299)

 Question 7398: 4(x-2)+5(3x-4)=0 How do you figure out what x is? Click here to see answer by bonster(299)

 Question 7405: 5x-7(2-4x) Simlify the expresisions showing you work, school is back in session and I need help remembering how to do this. Thanks Click here to see answer by bonster(299)

 Question 7516: how do i simplify a question like : 2/3(6h-1) Click here to see answer by bonster(299)

 Question 7617: Help me solve the following equations for the variable x: y=xtz and 3.5tpx=R Click here to see answer by longjonsilver(2297)

 Question 7610: Help me solve the following equation for the variable x: 4xz=p Click here to see answer by CharStar(110)

 Question 7642: The sum of three consecutive even integers is -24. Find the integers. I'm having trouble with this question because i don't remember consecutive numbers AT ALL!!! i'm in 10th grade in algebra 2, but this question is Algebra 1, because we're reviewing! Please help! ASAP!!! The sum of three consecutive even integers is -24. Find the integers. (Please show all work.) Click here to see answer by Earlsdon(6294)

 Question 7671: how do I solve x/2<4 { 1/4, 1/2, 1,2,3,5,8} I don't understand how to put a fraction as a numerater of a fraction.Thank You!! Click here to see answer by glabow(165)

 Question 7676: How do you simplify expressions? Example 8x - 4y + 3x Click here to see answer by glabow(165)

 Question 7786: A clown weighs 60lbs. more than a trapeze artist. The trapeze artist weighs two thirds as much as the clown. How much does each weigh? you have to make an eqation using this data. Click here to see answer by Earlsdon(6294)

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