# 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 73198: My question has to be solved using elimination. The two equations in the question are: 5x+2y=18 and, 3x+2y=10. How can I solve this and what is the correct answer? Thank you! Amber Robinson Click here to see answer by checkley75(3666)

 Question 73197: My question has to be solved using elimination. The two equations in the question are: 5x+2y=18 and, 3x+2y=10. How can I solve this and what is the correct answer? Thank you! Amber Robinson Click here to see answer by pradhyumna.kumar@gmail.com(62)

 Question 73591: is there a particular formula for adding and subtracting negative and positive numbers multiplying them dividing them thank you Click here to see answer by checkley75(3666)

 Question 73672: five gallons of 10% glucose solution is mixed wth x gallons of 40%glucose solution to obtain a 20% glucose solution. how many of the 40% solution were used? Click here to see answer by checkley75(3666)

 Question 73869: This is a worded problem. Two tuba players stand 100 yards apart. After each set of steps, the distance between them is one half of the previous distance. How many set of steps will they take before they are less than 10 yards apart? Click here to see answer by checkley75(3666)

 Question 73877: Given that T(x) = – 2x^2 – 5x – 8, evaluate : T(2). 2x=2x^2-5x-8 7x=2x^2-8 After this part i'm lost can anyone help Click here to see answer by bucky(2189)

 Question 73876: did I work this problem correctly 3(3x-1)=3x-2(3-x) 9x - 3= 3x - 6 + 2x 9x -3 =5x - 6 4x-3=-6 x=-.75 Click here to see answer by bucky(2189)

 Question 73875: Please help me solve by substition: y=1/2x+x 2y+2x=2 So far I did this: 2(1/2x+4)+2x=2 1x+8+2x=2 3x+8=2 3x+8-8=2-8 3x=-6 x=-2 y=1/2(-2)+4 y=-1+4 y=3 Is this right? gmt Click here to see answer by stanbon(57290)

 Question 73930: i cannot find a problem simliar to this one in my book, could you show me how it is done. Thanks so much 4(2x-1)=16 Click here to see answer by stanbon(57290)

 Question 73958: i know the anwer to this problem is 5/2, but i am not quite sure how it was completely solved thanks do i find a common denominator? i am studyingfor a test and can't remember some of the stuff i learned at the beeginning of the semester. thank you 4(2x-1)=16 Click here to see answer by checkley75(3666)
 Question 73958: i know the anwer to this problem is 5/2, but i am not quite sure how it was completely solved thanks do i find a common denominator? i am studyingfor a test and can't remember some of the stuff i learned at the beeginning of the semester. thank you 4(2x-1)=16 Click here to see answer by ffc_01(9)

 Question 73711: An Egyptian Fraction has the form , where is a positive integer. In ancient Egypt, these were the only fractions allowed. Other fractions between zero and one were always expressed as a sum of DISTINCT Egyptian fractions. For example, was seen as or . The preferred method of representing a fraction in Egypt used the "greedy" algorithm, which, at each stage, uses that Egyption fraction which eats up as much as possible of what is left of the original fraction. Thus the greedy fraction for would be . a. Find the greedy Egyptian fraction representation for . (I got ) b. Find the greedy Egyptian fraction representation for . (I got ) c. Find the greedy Egyptian fraction representation for , where is a positive integer. d. Find the greedy Egyptian fraction representation for the fraction , where is a positive integer. I know this might be a little complicated for this category, but I couldn't find any other place that would suit this kind of problem besides expressions with variables. Click here to see answer by Edwin McCravy(8906)

 Question 73961: Please help! I have tried to figure out the following problems for the past few days, but cannot understand. This subject is foreign to me. Whatever assistance you can provide, will be greatly appreciated. Also, can you please provide a step by step explanation so I can better understand the solution? Thanks. Simplify: a. 5x + 2y / 35x + 14y b. x^2 -5x -14 / 2x^2 - x - 10 Multiply: c. x^2 - x - 20 / x^2 - 3x - 10 . x^2 + 7x + 10 / x^2 + 4x - 5 d. 4x^2 - 9 / 4x^2 + 12x + 9 / (6x - 9) Perform the operation indicated. Be sure to simplify. a. 8/7+2x + x+3/2x+7 Find the LCD. Do not combine fractions. a. 12/5a^2 , 9/ a^3 b. 13/x^2 - 16 , 7/x-4 Add: a. 2/y-1 + 2/y+1 Subtract: a. 3/x^2 - x - 12 + 2/x^2 + x - 20 Solve and check problems. a. x - 2/4x = 1/6 b. 3/x + 5 = 3/3x - 2 Solve: a. 5/12 = x/8 Use a proportion to answer: a. If a traveler's bags weighed 39 kilograms and 50 kilograms is equivalent to 110 pounds, how many pounds does the bag weigh rounded to the nearest pound? Find the missing coordinate to complete the ordered-pair solutions to the given linear equivalent. y = 6x +5 5x-2y = 9 (a) (0,?) (a) (7,?) (b) (3,?) (b) (?,-7) Find the slope and the y-intercept. a. 7x + 3y = 4 Write the equation of the line in slope-intercept form. a. m = 5, y-intercept (0,-6) b. The equation of a line is y = 3/5 x - 5 What is the slope of a line parallel to it? What is the slope of a line perpendicular to it? a. Find the domain and range of the relation. b. Determine whether the relation is a function. { (5.6,8), (5.8,6), (6,5.8), (5,6) } { (85,3), (95,11), (110,15), 110,20) } Given the following functions, find the indicated values. f(x) = 3 - 5x (a) f(-1) (b) f(1) (c) f(2) Click here to see answer by stanbon(57290)

 Question 74308: At a ice cream shop cones were \$1.10 and sundaes were \$2.35 in one day they sold a total of 172 cones and sundaes totaling \$294.20 how many were cones? I have no idea how to solve this could you please help? Thank you Click here to see answer by jim_thompson5910(28549)

 Question 66938: please help me solve this: i am not sure if i entered this is correctly but i hope that i did. It is the cube root of 27x^9y^4z^7 Click here to see answer by jim_thompson5910(28549)

 Question 74368: Please help me solve this - Use substitution to solve each system of equations. If the system does not have exactly one solution, state whether it has no solutions or infinitely many solutions. and . Click here to see answer by jim_thompson5910(28549)