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

Algebra ->  Algebra  -> Expressions-with-variables -> Questions on Algebra: Expressions involving variables, substitution answered by real tutors!      Log On

 Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations! Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

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

 Question 377853: Solve using the multiplication principle first. Then use the elimination method. 2x+y=13 4x+2y=23 I'm not sure if I multiply equation #1 by -2 to eliminate x? If I do that, then I eliminate y. I'm confused, what do I multiply? Thank you. Click here to see answer by mananth(12270)

 Question 377895: Problem : 5(2q - 1) = -5 + 10q Question : What is Q ? Click here to see answer by nyc_function(2733)

 Question 377894: Solve by rearranging the equations first. Then use the multiplication principle and then use the elimination method: 3x=8y+11 x+6y-8=0 How do I multiply each equation by to eliminate x? What do I multiply equation #1 by? I thought I should multiply equation #2 by -3 to eliminate e? I know I have to rewrite the equations too. Please help. Thanks! Click here to see answer by stanbon(57940)

 Question 377809: If 45 is added to a two-digit number, the result is a number with the same digits, but in reverse order. The sum of the digits is 11. What is the original number? Click here to see answer by richard1234(5390)

 Question 378106: 1.how to solve C(n)= -3-6 AND C(n) =n-4 2. how to solve m=5p+8 and m=-10p+3 3. how to solve y=4x+12 1/2 and y= 1/4 x +4 4. how to solve h=6g-4 and h=g+28 5. how to solve a=2/5b-3 and 2b-18 Click here to see answer by nyc_function(2733)

 Question 378527: Can someone help me with this problem please, I suck at math. 2(7y+5) - 2[(10y+1) – (2y + 5)] = Click here to see answer by robertb(4012)

 Question 378629: This is actually elimination but my question is if my problem is 2x+2/3y=4 x-1/2y=7 How can i figure it out i've tried everything but when i plug it back in it doesn't work. Thanks Click here to see answer by ankor@dixie-net.com(15745)

 Question 378609: Instruction:Wrie the equation of the line through the given point and parallel to the given line 1.y= 3x -4 (-2,1) Click here to see answer by Fombitz(13828)

 Question 378761: The equation is: dy/dx What is the answer and how do you work it out? THANK YOU SO MUCH. Click here to see answer by jim_thompson5910(28696)

 Question 378763: the question is: -ab/(-a) What is the answer? And how do you work it out? THANK YOU. Click here to see answer by jim_thompson5910(28696)

 Question 378764: The question is: 36e/24de What is the answer? How do you work it out? THANK YOU. Click here to see answer by jim_thompson5910(28696)

 Question 378773: what is? dy/dx THANK YOU. dy/dx is the equation. Click here to see answer by jim_thompson5910(28696)

 Question 378779: What is? 5ab+(6a*2b) How do you do it and what is the answer? THANK YOU. Click here to see answer by jim_thompson5910(28696)

 Question 378793: What is? (6a^2 * 6b^2 / 9ab / 2a) ^2 THANK YOU. Click here to see answer by mananth(12270)

 Question 378784: what is? (6a squared * 6b squared / 9ab / 2a) squared What is the answer? How do you work it out? THANKS. Click here to see answer by mananth(12270)

 Question 378881: 2 brothers bought together 15 books, one bought 7 books, how many books did the other brother buy? Click here to see answer by ewatrrr(10682)

 Question 378884: A rental car shop rents their vehicles for \$50.00 per day plus \$.05 per mile driven. If Sally rents the car for one day and drives a total of 90 miles, how much must she pay to the rental car shop? Click here to see answer by ewatrrr(10682)

 Question 379234: could you explain to me how to answer questions with two variables and show the steps, such as 15-2y=3y? Click here to see answer by Alan3354(31487)

 Question 379612: good morning can you help me answer this problem Assume that the probability of a customer selecting a jelly filled donut is 20%. What is the probability that the next two customers will both buy jelly filled donuts? Click here to see answer by Fombitz(13828)

 Question 380378: 2) Solve the system of equations by the addition method. x/2+y/4=2 x/4-y/8=2 Type an ordered pair if possible. Or the other options are: There are infinitely many solutions, or there is no solution. Click here to see answer by richard1234(5390)

 Question 380594: My child's Algebra teacher uses problems of the week based on Gary Tsuruda's book "Putting It Together". This week's problem has me stumped. I am educated in math but,... The problem: A man has a bag of coins. He meets three people. The first one gets 1/2 the coins +2. The second gets 1/2 the coins +2. The third gets 1/2 the coins +2. When the man returns home he has two coins in his bag. How many did he start with? I need help with the equation. I tried working backwards, but the answer does not work in the problem. Thanks in advance for any help. Click here to see answer by ptaylor(2052)

 Question 381295: The sum of the angle of a triangle is 180〫. If one angle of a triangle measures x and the second angle measures (5x+18)〫, express the measure of the third angle in terms of x. Simplify the expression. Click here to see answer by mananth(12270)
 Question 381295: The sum of the angle of a triangle is 180〫. If one angle of a triangle measures x and the second angle measures (5x+18)〫, express the measure of the third angle in terms of x. Simplify the expression. Click here to see answer by stanbon(57940)