# 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 395720: Write the expression for the cube of the difference of a number and 43. Click here to see answer by Alan3354(30993)

 Question 395755: if angela's age is decreased by 9 and the diffrence is doubled the rsult is the same as 7 more than her age. how old is anglea? Click here to see answer by ewatrrr(10682)

 Question 395763: An appliance repairman charges a flat fee of \$35 plus \$28 for every hour worked. If the total bill for fixing a washing machine was \$133 how many did the repairman take to fix the machine? Click here to see answer by richard1234(5390)

 Question 395769: If Angela's age is decreased by 9 and the difference is doubled the result is the same as 7 more than her age. How old is Anglea? Click here to see answer by ewatrrr(10682)

 Question 395883: Not sure if this is the right section, but Im having trouble with problems such as , solve for x. Click here to see answer by richard1234(5390)

 Question 395935: This tells you how dumb I am: My son has a math problem...He is in 4th grade. If says Write the expression. Let P stand for the number of pencils jody has. 1. 3 fewer pencils than Jody has 3-P 2. Half as many pencils as jody has. Ok i am lost. please help me. Click here to see answer by mananth(12270)

 Question 395998: Plant food C is sprinkled around the base of the plant once every "d" days. Write an algebraic expression that represents the number of times per year plant food C is used. Click here to see answer by richard1234(5390)

 Question 396154: i need to use the substitution method to find the variables x,y, and z in the equations 3x+2y-4z=20 ; 2x-y+3z=-5 ; and x+y+z=3. ( i solved for y, using the 3rd equation, to form the two new equations of 5x-2z=26 and x=z-8) i dont know what to do next. please help! i would greatly appreciate it Click here to see answer by Edwin McCravy(8909)

 Question 396322: 5x2+3x-2+(6x2-4) the x2, the 2 is a squared it is simplifying expressions Click here to see answer by rfer(12662)

 Question 396436: ACTUAL PROBLEM 3x+2y=0 9x-24=2y WHAT I HAVE TRIED -9x+2y=24 Multiplied equation by -1 -3x-2y=0 -12x=24 x=2 could u please explain Click here to see answer by rfer(12662)

 Question 396505: Trail Snax Corp. mixes raisins that cost \$5.00 per kg with peanuts that cost \$3.80 a kg. How many kilograms of raisins should be mixed with 10kg of peanuts to obtain a mixture worth \$4.00 per kg? Click here to see answer by stanbon(57361)

 Question 396962: What is the equation of the horizontal line that has a y-intercept of −4 Click here to see answer by Alan3354(30993)

 Question 396960: I am trying to help my son with this problem and I can't figure out where to begin on this one. I was fine until fractions came into play 2/3 +13y+1/4=2 Should he add the fractions first and then take next steps? Click here to see answer by scott8148(6628)

 Question 397209: what is the solution to this equation y=5x-2 Click here to see answer by ewatrrr(10682)

 Question 397613: Joy lives 466 miles from Max. At 8a.m., Joy starts driving toward Max's home at 60 mph. At 9a.m., Max starts driving toward Joy's home at 56 mph. How many miles will Joy have driven when they meet each other? Click here to see answer by robertb(4012)

 Question 397642: 8. Write the expression using exponents. Do not solve. b ∙ b ∙ b ∙ b ∙ b ∙ b ∙ b Click here to see answer by Edwin McCravy(8909)
 Question 397642: 8. Write the expression using exponents. Do not solve. b ∙ b ∙ b ∙ b ∙ b ∙ b ∙ b Click here to see answer by richard1234(5390)

 Question 397674: if y varies inversly to x and y is 6 when x=56 what is x when y =24 Click here to see answer by robertb(4012)

 Question 397724: Please help me solve this practice test question: If ab=10, and a-squared + b-squared = 30, solve for y in the equation, y=(a+b)squared. Can you explain it also? Many thanks! a. 40 b. 45 c. 50 d. 55 Click here to see answer by richard1234(5390)

 Question 397595: Anton has 52 coins, some of them quarters and the rest dimes. The value of the coins is \$10.00. How many coins of each type does he have? Click here to see answer by scott8148(6628)

 Question 397962: 2. Solve the system by substitution. 6x - 5y = 11 7x + 5y = 2 (1, -2) (1, -1) (2, -1) (2, -2) 3. Solve the system by substitution. x - y = -11 x + 3y = 5 (-7, 4) (-8, 4) (-7, 5) (-8, 5) 4. Solve the system using elimination by addition. x + y + z = 0 -x + y - 2z = 6 2x + y + z = 0 (1, 1, -1) (0, 2, -1) (0, 2, -2) No solution 5. Solve the system using elimination by addition. 2x + 2y + 3z = 23 2x + 2y + 5z = 33 -4x - 4y - 8z = -55 (0, 4, 5) (0, 3, 6) (0, 5, 4) No solution 6. Solve the system using elimination by addition. 4x - 2y + 2z = 2 -x + y - 3z = -4 4x - 3y + 7z = 9 a.(-1, -7, 0) b.(3, 3, 2) c. {(2s – 3, 5s – 7, s) | s is any real number} d. No solution Click here to see answer by solver91311(16897)

 Question 398182: Barry us paid double-time for each hour over 40. Last week he worked 47 hour and earned 486, what is his hourly rate Click here to see answer by josmiceli(9686)

 Question 398169: There are 160 students. 65 of them are doing math and 45 of them are dong science. How many of them could be taking both subjects? what is the least amount of students taking both? what is the greatest amount of students taking both? How many students could be taking neither subject? Click here to see answer by robertb(4012)