# 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 613302: Use substitution to find the value of d if a = 12, b = 3, and c = 4. Click here to see answer by jim_thompson5910(28598)

 Question 613899: how would you solve a system of equations like this one Y=4x+4 Y=-1.5x+6 Click here to see answer by stanbon(57424)

 Question 614090: how can I solve these two equations by substituton: 400=lw 60=l+2w Click here to see answer by solver91311(16897)

 Question 614184: How do you make one of these equations equal 48? The equations and numbers are x+(x+2)+(x+4)=48; 16,17,18 x+(x+1)+(x+2)=48; 15,16,17 Click here to see answer by ewatrrr(10682)

 Question 614317: Hello! And thank you for helping me with this question! Question: Find a solution to the inequality: x(7 -x)> 8 I tried distributing the x outside of the parenthesis to the 7 and -x in the parenthesis, but then I got stuck. Could you please help me solve this? Thank you! Click here to see answer by stanbon(57424)

 Question 614324: how do you solve when there are two letter variables, i.e. d=vt + .5at^2 (solve for a) Click here to see answer by asuar010(324)

 Question 615302: I am needing help with a problem. 18-[8+(7-3)] Click here to see answer by stanbon(57424)

 Question 615506: The quotient of Y and 6 is 29. Find the value of Y Click here to see answer by jim_thompson5910(28598)

 Question 615942: could u give me 8 equations with variables? Click here to see answer by richwmiller(9143)

 Question 616005: I need to translate this problem as an equation and solve it. If Chen gives Elyse \$5, they will have the same amount of money. If Elyse gives Chen \$5, chen will have three times as much as Elyse has. how many dollars do they have together? Thank you David R. Click here to see answer by stanbon(57424)

 Question 616190: Find the area of the triangle shown on the right with base 21/5 yards and height 5/6 yard. The area of a triangle equals half the product of its base and height. The area is yd Click here to see answer by ewatrrr(10682)

 Question 617106: Solve the given equation for the indicated variable. 7x - 5y = 2(x+1);x Click here to see answer by nerdybill(6963)
 Question 617106: Solve the given equation for the indicated variable. 7x - 5y = 2(x+1);x Click here to see answer by josmiceli(9698)

 Question 617309: A number that is 6 less than y? Click here to see answer by scott8148(6628)

 Question 617639: Simplify the expression -(12b-10) + 5(3b - 2) Click here to see answer by jim_thompson5910(28598)

 Question 617767: How do I do x+y=34 and -2x+4y=110 by elimination? Click here to see answer by scott8148(6628)

 Question 617776: A chemist needs 12 liters of a 36% acid solution. How many liters of 18% acid should be combined with a 45% acid solution to obtain the proper mixture? My teacher didn't teach us this at all. Please, provide an explanation. Click here to see answer by josmiceli(9698)
 Question 617776: A chemist needs 12 liters of a 36% acid solution. How many liters of 18% acid should be combined with a 45% acid solution to obtain the proper mixture? My teacher didn't teach us this at all. Please, provide an explanation. Click here to see answer by scott8148(6628)

 Question 617694: Original price 22.95 books are on sale for 35% off but there's 6% sales tax what is the total cost??:) Click here to see answer by Theo(3472)

 Question 619347: if it cost \$78.86 to buy 3 tickets in japan plus 2 tickets in switzerlan. 3 tickets in switzerland plus 2 tickets in japan cost \$74.84. how much does an average movie ticket cost in each country? Click here to see answer by sophxmai(60)

 Question 619349: A store mixes kenya coffee worth \$11 per kilo and turkish coffee worth \$13 per kilo. the mixure is to sell for \$12 per kilo. find how much of each should be used to make a 444kilo mixure. Click here to see answer by Alan3354(30993)

 Question 619418: Can you please explain this problem to me. I have given some of the solutions I have tried but do not know if I am doing it right. To prove or disprove the following: The expression n2 - n + 41 produces a prime number for every positive integer n. (Hint: try the following numbers 1, 10, and 41). I have tried this in two seperate ways-The first reading the 2 as a power of. Therefore making the problem n^2 -n + 41. The second attempt was n(2) -n +41. n^2 - n + 41 = 1^2 - 1 + 41 = 1 - 1 + 41 = n=41 n(2) - n + 41 = 1(2) - 1 + 41 = 2 - 1 + 41 = 1 + 41 = 41 Click here to see answer by jim_thompson5910(28598)

 Question 619724: d^2 - 10d + 25 A.(d-5)^2 B. (d+5)^2 c. (d-5)(d+5) d. (d-25)(d-1) Thank you Click here to see answer by ewatrrr(10682)

 Question 619743: 4x2 – 81y2 A. (2x + 9)(2x – 9) B. (2x + 9y)(2x – 9y) C. (2x + 9y)2 D. (2x – 9y)2 Thank you! Click here to see answer by ewatrrr(10682)

 Question 619749: a2 + 2ab – 80b2 A. (a – 10)(a + 8b) B. (a – 10b)(a – 8b) C. (a + 10b)(a – 8b) D. (a + 10b)(a + 8b) Thank you Click here to see answer by ewatrrr(10682)

 Question 620166: a^2 + 2ab - 80b^2 A. (a - 10)(a + 8b) B. (a - 10b)(a - 8b) C. (a + 10b)(a - 8b) D. (a + 10b)(a + 8b) thanks Click here to see answer by ewatrrr(10682)

 Question 620484: a2 + 6ab – 7b2 A. (a + 7b)(a – b) B. (a + 7b)(a + b) C. (a – 7b)(a – b) Thanks D. (a – 7)(a + b) Click here to see answer by ewatrrr(10682)
 Question 620484: a2 + 6ab – 7b2 A. (a + 7b)(a – b) B. (a + 7b)(a + b) C. (a – 7b)(a – b) Thanks D. (a – 7)(a + b) Click here to see answer by lynnlo(4164)

 Question 620514: if an object is dropped from a height of 37 feet, the function h(t)= -16t^2 +37 gives the height of the object after t seconds. Graph the function. Thanks Click here to see answer by Alan3354(30993)

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