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

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 Question 391673: What is the elimination method 2r-5s=-29 and 5r+2s=58? Click here to see answer by mananth(13127)

 Question 391804: I'm having a problem with following equation using Substitution algebra. I understand substitution however this particular equation has me stumped. 4y + x = -2 x = -4y I understand I need to plug the -4y in for the x in the first equation. What I don't understand is how to get the 4y on the other side of = sign in order to isolate the y. Thanks. Click here to see answer by Alan3354(34674)

 Question 391809: jim is able to sell a hand-carved statue for \$670 which was a 35% profit over his cost. How much did the statue originally cost him? please break it down Click here to see answer by stanbon(60771)

 Question 391811: if r =5z then 15z=3y, then r =? Click here to see answer by jim_thompson5910(29613)

 Question 391836: Solve by the substitution method 8x-4y= -84 4x + 45 = y 6m+n=29 m-6n=48 4x+9y=51 -4x+y=19 5x+2y=-9 -5x+y=33 Click here to see answer by rfer(13569)

 Question 391813: the city council decided to add 0.3% tax on motel and hotel rooms. if a traveler spends the night in a motel room that cost \$55 before taxes ,how much will the ciity receive in taxes from him. please bread it down. thank you Click here to see answer by rfer(13569)

 Question 391806: the sales price of a car is 12,590 wich is 20% off the original price . what is the original price? Click here to see answer by rfer(13569)

 Question 391888: Can someone please help with this Algebra problem? I am so confused by this. Use an associative law to find an expression equivalent to s+(r + 36) Thanks Click here to see answer by stanbon(60771)

 Question 391897: solve by the substition method 3x - 2y = -12 9x + 51 = y find the solution and type the ordered pair Click here to see answer by lwsshak3(7677)

 Question 392045: Can you help me? If sally and rocky travel on motorcycles toward each other from chicago and indianapolis which are 350km apart and they are biking at the rates of 110km/h and 90km/h they started at the same time, in how many hrs will they meet. Shelly Click here to see answer by rfer(13569)

 Question 392046: Can you help me? Muscle movers charge \$85 plus \$40hr to move households across town, champion moving charges \$60hr for cross town moves, for what lengths of time is champion more expensive? Shelly Click here to see answer by rfer(13569)

 Question 392047: Can you help me? In 1988 Florence Griffith Joyner set a record of the 10.49sec in the women's 100m dash, using the equation R=-0.0433 + 10.49 and t years after 1988, what years was the record between 10.15 and 10.35 sec. Thank you! Shelly Click here to see answer by stanbon(60771)

 Question 392211: 32x + 23y = 10,100 12x + 14y = 5400 substituttion the varible. I selected equation 2 first to solve for y, but couldn't get y by itself. please help... subtracted 12x from both sides of 12x + 14y = 5400 I got: 14y = 5400-12x....what is my next step? Click here to see answer by edjones(7794)
 Question 392211: 32x + 23y = 10,100 12x + 14y = 5400 substituttion the varible. I selected equation 2 first to solve for y, but couldn't get y by itself. please help... subtracted 12x from both sides of 12x + 14y = 5400 I got: 14y = 5400-12x....what is my next step? Click here to see answer by stanbon(60771)

 Question 392325: ab/4 times 2/bc find the product and write in simpliest form Click here to see answer by NancyLam(35)

 Question 392364: Evaluate each expression for n=6 and n=15. N+15____ _____ 5*n____ _____ n/3 _____ _____ n-5____ _____ Do I just 6+15= and then 15+15= and write the answer in the blank space? Click here to see answer by rfer(13569)

 Question 392466: Hi I have another problem I need help with! Go figure huh? I need to find a solution for this... 8y - 24 ≥ 30 Solve if y=2 Any help would be greatly appreciated! Thanks Blaine Click here to see answer by richard1234(5390)

 Question 392568: use substitution to solve for x and y y+2x=12 x+2y=12 Click here to see answer by haileytucki(390)

 Question 392869: Can you get this standard form equation into slope intercept form? x-y=2 Is it possible to have a -y? Click here to see answer by Earlsdon(6294)
 Question 392869: Can you get this standard form equation into slope intercept form? x-y=2 Is it possible to have a -y? Click here to see answer by checkley79(3056)

 Question 392860: How to solve for x and y? X+Y=30 and X*Y=209 Click here to see answer by checkley79(3056)

 Question 392997: Blinn College in Bryan has 620 students. The difference between male students and female student is 20. How many female students are there? Click here to see answer by robertb(4012)

 Question 393168: what will it cost to carpet a room with indoor/outdoor carpet if the room is 10 feet wide and 12 feet long? the carpet costs 12.51 per square yard.please break problem down. Click here to see answer by ewatrrr(11162)

 Question 393170: An instrument store gives a 10% discount to all students off the original cost of an instrument. During a back to school sale an additional 15% is taken off the discounted price. Julie, a student at the local high school, purchases a flute for \$306. how much did it originally cost? plesase break the problem down Click here to see answer by ewatrrr(11162)

 Question 393186: Given: 2x + 3y = 12 2x - y = 4 What is the value of x + y? A -5 B -1 C 1 D 5 Click here to see answer by ewatrrr(11162)

 Question 393213: how do you translate and solve this equation: If you subtract a number from four times its square, the result is three. thank you :) Click here to see answer by josmiceli(10616)

 Question 393382: How do you combine like terms and then write them in a factored form for the equation 32+20x? Click here to see answer by josmiceli(10616)
 Question 393382: How do you combine like terms and then write them in a factored form for the equation 32+20x? Click here to see answer by Alan3354(34674)

 Question 393433: two cars leave town at the same time going in opposite directions. one car travels 44mi/h and the other travels 55mi/h. in how many hours will they be 297 miles apart? Click here to see answer by stanbon(60771)
 Question 393433: two cars leave town at the same time going in opposite directions. one car travels 44mi/h and the other travels 55mi/h. in how many hours will they be 297 miles apart? Click here to see answer by rfer(13569)

 Question 393555: the 18th and 52nd terms of an arithmetic progression are 3 and 173 respectively. find 25th term Click here to see answer by robertb(4012)

 Question 393573: a canoeist Paddled For 4 Hours With A 6 Km/h Current To Reach A Campsite. The Return Trip Against The Current Took 10 Hours. Find The Speed Of The Boat In Still Water? Click here to see answer by mananth(13127)

 Question 393571: Paddled For 3 Hours With A 7 Km/h Current To Reach A Campsite. The Return Trip Against The Current Took 10 Hours. Find The Speed Of The Boat In Still Water? Click here to see answer by mananth(13127)