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

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 Question 399658: How do you solve: 5x + 24 = 8x Click here to see answer by rfer(13569)

 Question 399650: I need to solve. -5x>3.0 ( the > has a line under it) Click here to see answer by Alan3354(34674)

 Question 399692: The sum of two numbers is 15, and their differences is 3. What are the numbers? The directions say...Solve, using two equations in two variables. Click here to see answer by Alan3354(34674)

 Question 399717: how do i solve -4x-y=y and 3x-y=0 in subsitution form. Click here to see answer by MathLover1(7480)

 Question 399832: Speed Seed Company mixes bluegrass seed that costs \$7.60 per kilogram with ryegrass seed that costs \$6.25 a kg. How many kiolgrams of bluegrass seed should be mixed with 200 kg of ryegrass seed to make a mixture worth \$7.00 per kg? Click here to see answer by scott8148(6628)

 Question 399885: Two sides of a triangle have the same length. The remaining side is one third as long as each of the other sides. If the perimeter of the triangle is 315 cm, what is the length of each side? Click here to see answer by unlockmath(1657)

 Question 399920: Solve: By himself, Tim can complete his paper route in 80 minutes. With the help of Sue it takes 50 minutes. HOw many minutes would it take Sue to do the route by herself? Could you please explain step by step how you got this problem so I can understand more problems like this when I see them? Click here to see answer by robertb(4012)

 Question 399954: translate to an algebraic expression. use x and y for variables. one less than product of two numbers Click here to see answer by richard1234(5390)

 Question 400011: Could someone please explain how to do these problems, we are solving problems with two variables and I do not understand how to even start working on them, the directions state...Solve by the addition-or-subtraction method, if someone could explain how they are solved I think I could get it.... 3x-y=-5 2x+2y=-6 I would greatly appreciate it...thanks!!!! Click here to see answer by ewatrrr(11148)
 Question 400011: Could someone please explain how to do these problems, we are solving problems with two variables and I do not understand how to even start working on them, the directions state...Solve by the addition-or-subtraction method, if someone could explain how they are solved I think I could get it.... 3x-y=-5 2x+2y=-6 I would greatly appreciate it...thanks!!!! Click here to see answer by stanbon(60771)
 Question 400011: Could someone please explain how to do these problems, we are solving problems with two variables and I do not understand how to even start working on them, the directions state...Solve by the addition-or-subtraction method, if someone could explain how they are solved I think I could get it.... 3x-y=-5 2x+2y=-6 I would greatly appreciate it...thanks!!!! Click here to see answer by solver91311(18785)

 Question 400257: we are learning 2 variable word problems, and usually math is easy for me, but for some reason this just isn't sticking in my head right. i need help with this problem, "at dive movie theater, 2 bags of popcorn & 3 bags of potato chips cost \$1.80. 3 bags of popcorn and 2 bags of potato chips cost \$1.70. What is the cost of one bag of popcorn? what is the cost of one bag of potato chips? here is what i have figured out so far 3p+2c=1.70 → 2(3p+2c=1.70) → 6p+4c=3.40 3p+2p=1.70 2p+3c=1.80 → -3(2p+3c=1.80) → -6p-9c=-5.40 ----------- -3p-7c=-3.70 but i honestly have NO idea what to do from here, any help?(: Click here to see answer by scott8148(6628)

 Question 400338: what is the anwser to 8x=-2y-10 and 2x=4y? and how did you get it? Click here to see answer by rfer(13569)

 Question 400492: m/12 x 3 = 108. What does m equal? Click here to see answer by edjones(7794)

 Question 400562: Combine like terms. Write all answer in descending order. 3x^4-7x+x^4-2x This is what I came up with 3x^4-7x+x^4-2x (3x^4+x^4)(-7x+2x) (4x^4)(-5x) 20x Click here to see answer by richard1234(5390)

 Question 400750: i have a question about my little cosins homework im trying to help him but i keep comig up with the wrong answer can you show me how to do this problem then i can get it from here YOU HAVE TO SOLVE EACH PROBLEM WITH SUBSTITUTION y=6x-11 -2x-3y=-7 Click here to see answer by nerdybill(7090)

 Question 400760: Simplify the expression please. 6d squared * (2d to the fifth power)to the fourth power Click here to see answer by algebrahouse.com(1279)

 Question 400786: 12x to the 4th power times 3x to the 3rd power Click here to see answer by rfer(13569)

 Question 400917: What is the solution to this system of equations? Why did you chose the method you did? x+y=10 x-y=22 I believe I use the substitution method, but I am not sure. Click here to see answer by richard1234(5390)

 Question 401355: I need to solve by using the elimination method but the fraction is throwing me off and I am not sure how to solve this one. Thank you 0.3x-0.2y=4 0.2x-0.3y=5/23 Click here to see answer by dnanos(83)

 Question 401393: If it is -10 in Alaska and -5 in New York, what is the difference in temperature? Click here to see answer by richard1234(5390)

 Question 401501: A product will break even or produce a profit only if the revenue R (in dollars) from selling the product is at least the cost of C (in dollars) of producting it. Suppose that the cost to produce x units of wallpaper is C=50x+6000, while the revenue is R=80x. For what value of x is R at least equal to C? Click here to see answer by ankor@dixie-net.com(16523)