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

Tutors Answer Your Questions about Expressions-with-variables (FREE) Get help from our free tutors ===> Algebra.Com stats: 2013 tutors, 419621 problems solved View all solved problems on Expressions-with-variables -- maybe yours has been solved already! Become a registered tutor (FREE) to answer students' questions. Click here to see problems AND answers on one page Question 1352: how do u solve 3x +15 when x=12 Click here to see answer by usyim88hk(157)   Question 1769: What is the %Body fat of a man that weighs 156 pounds (b) and has a waist measurement of 32 inches (w)? (-98.42 + 4.15(w) - 0.082b)/b Click here to see answer by longjonsilver(2297)   Question 1897: X2+64 Click here to see answer by longjonsilver(2297)   Question 2169: which of the following is (are) like terms? 1.34x and - 18x 2. 2x and 2xy 3. x3 and 3x A. 1 only B. 2 only C. 1 and 3 only D. 2 and 3 only E. 1, 2, and 3 Click here to see answer by longjonsilver(2297)   Question 3249: simplify: -(x-1)-(3x-2)-(7x-5) Click here to see answer by Jessmh123(22)   Question 3263: write a verbal expression for the algebraic expression 4m^2-2m Click here to see answer by Jessmh123(22)   Question 3264: write an algebraic expression: triple the difference of 55 and the cube of w Click here to see answer by Jessmh123(22)   Question 3264: write an algebraic expression: triple the difference of 55 and the cube of w Click here to see answer by drglass(89)   Question 3342: Please help I am not sure how to solve the following! s=1/2 gt^2 (solve for g) Click here to see answer by longjonsilver(2297)   Question 3342: Please help I am not sure how to solve the following! s=1/2 gt^2 (solve for g) Click here to see answer by Pieter(35)   Question 3706: whats5+5 b Click here to see answer by longjonsilver(2297)   Question 3785: 6 (2x - 4) - 3 [2 - (3y + 4)] Click here to see answer by inlovewitmath(1)   Question 3785: 6 (2x - 4) - 3 [2 - (3y + 4)] Click here to see answer by longjonsilver(2297)   Question 4146: simplify- 3x(4+2y)-2x(3+8y) This is my answer- 12x +6xy-6x+16xy Why is this wrong??? Click here to see answer by longjonsilver(2297)   Question 4163: in substitution how do you solve for a equation for x. then solve it for y? example 3x-5y=12 Click here to see answer by Earlsdon(6287)   Question 4148: Solve by frist eliminating the decimal numbers. 0.5x + 3.4 = 2.0x + 12.4 Click here to see answer by ntnk(54)   Question 4423: This new math sure gets me. I am a senior and trying to answer this question. [2x(9+7)-4]/7= Thank you. Click here to see answer by ichudov(499)   Question 4361: find the sum or difference indicated for each pair of polynomials (4x - 6x + 5) + (3x + 14x - 6) Click here to see answer by ichudov(499)   Question 4824: 12h+5h Click here to see answer by Abbey(339)   Question 4823: 12h+5h Click here to see answer by Abbey(339)   Question 4862: Dear Abbey can you help me with these problems? Show me a step by step way of doing it? 4x < 36 -4 < 36 4x >-36 Thank You very much! Click here to see answer by Abbey(339)   Question 4860: Hello I'm having a problem with this solution. Bobbie sold 35 T shirts and socks. T-shirts were sold at $9.00 and socks for $5.00. Total sales came to $287. How many of each were sold? What was the total dollar sales of each? Thank You for your help. Click here to see answer by Abbey(339)   Question 4946: 2x-5(x+3)=81 Click here to see answer by rapaljer(4667)   Question 4975: -4(z+7)=23 -90=3(-2z-8) -(7-h)=13 120=9n+6n 15q-18q-12=9 Click here to see answer by lotanez(23)   Question 4972: find x and y intercept, then graph y=x+3 Click here to see answer by rapaljer(4667)   Question 5254: how do you get the x and y varibles in this problem 4x - 3y = 12 x + 2y = 14 Click here to see answer by xcentaur(357)   Question 5256: how do you use elimination to solve for the x and the y 11x - 5y = 80 9x - 15y = 120 Click here to see answer by xcentaur(357)   Question 5302: Please can you show me how to solve this problem I know the answere but I cant solve it x^2+y=31 y^2+x=41 Click here to see answer by khwang(438)   Question 5395: what are more problem you can help me with. plase e-mail me Click here to see answer by Abbey(339)   Question 5394: what do you mean when you say -2x+14-4+-2-7+5 Click here to see answer by Abbey(339)   Question 5468: What is the specific difference between a "term" and a "factor"? Thank you. Click here to see answer by rapaljer(4667)   Question 5474: i'm not quite sure how to solve this using substitution. y=7-x y-x=3 I got(2,9) but i'm not quite sure if thats the right answer. Also, does the system have exactly one solution, or more? Thanks for helping me! Click here to see answer by rapaljer(4667)   Question 5473: i'm not quite sure how to solve this using substitution. y=4x x+y=5 I got(1/4,1) but i'm not quite sure if thats the right answer. Also, does the system have exactly one solution, or more? Thanks for helping me! Click here to see answer by Abbey(339)   Question 5476: i'm not quite sure how to solve this using substitution. x+5y=4 3x+15y=-1 Also, does the system have exactly one solution, or more? Thanks for helping me! Click here to see answer by Abbey(339)   Question 5432: hello. Could you please help me with a problem? i'm wondering what 2x-4y>-6 would look like on a graph, and if it would be shaded above the line or not. on the question that i'm trying to answer, it gives me 4 of the same equations, and asks which one is graphed at the right. the graph that they show is at (-3,1 1/2), and shaded above the line with a straight line. all four of the equations that are given are the same except that the sign in the middle changes to something like <, or > , or those with lines underneath them. Sorry if this is confusing to you, but it is really confusing to me. thanks for helping, or trying to help me. Click here to see answer by longjonsilver(2297)   Question 5477: i'm not quite sure how to solve this using substitution. 3x-2y=11 x-y=4 Also, does the system have exactly one solution, or more? Thanks for helping me! Click here to see answer by Abbey(339)   Question 5585: This question is actually about elimination because there werent any catorgories for elimination. My question is: 2x+y=1 10x-4y=2 My answer was (1/2,0) but I don't think that this is the right answer. Thanks for the help! Click here to see answer by Earlsdon(6287)   Question 5822: hello. i have a question. what is the y-intercept of the line with the equation 5x-1/6=3? Click here to see answer by longjonsilver(2297)   Question 5890: This question is on elimination...and it is also my last question... i just wanted you to check my answers to make sure that they were right. -1/3x-4/3y=-2 1/3x-2/3y=4 My answer was (4,-4) Is this right? thank you so so much!~ Click here to see answer by Abbey(339)   Question 5889: This question is on elimination... 0.5x+0.5y=-2 x-0.25y=6 My answer was (2.5,-14) Is this right? thanks Click here to see answer by Abbey(339)   Question 5888: This question is on elimination... 4x-2y=-14 3x-y=-8 My answer was (-2 7/10,-12 4/10) Is this right, because it looks way too big to be the answer thanks Click here to see answer by Abbey(339)   Question 5888: This question is on elimination... 4x-2y=-14 3x-y=-8 My answer was (-2 7/10,-12 4/10) Is this right, because it looks way too big to be the answer thanks Click here to see answer by longjonsilver(2297)   Question 5732: I am 50 years old and I am taking a online math course online and i cannot figure out this with the fractions in it: Solve each inequality. Give the solution set in both interval and graph forms. 7/5(10z-1)<2/3(6z+5) Click here to see answer by Abbey(339)   Question 6087: This question is on the Addition Method rather than the Substitution Method. When using the Addition Method won't you only solve for 1 variable? Here is the problem below: Problem: (Eq.1) 3a + 2b = 8 (Eq.2) 5a + 2b =2 -1(3a) + -1(2b) = -1(8) -3a + -2b = -8 5a + 2b = 2 _______________ 2a = -6 2a/2 = -6/2 a = -3 If I canceled out "b" how do I solve for "b". My instructor wrote this on my test: b=? Thanks, TSJ Click here to see answer by Abbey(339)   Question 6087: This question is on the Addition Method rather than the Substitution Method. When using the Addition Method won't you only solve for 1 variable? Here is the problem below: Problem: (Eq.1) 3a + 2b = 8 (Eq.2) 5a + 2b =2 -1(3a) + -1(2b) = -1(8) -3a + -2b = -8 5a + 2b = 2 _______________ 2a = -6 2a/2 = -6/2 a = -3 If I canceled out "b" how do I solve for "b". My instructor wrote this on my test: b=? Thanks, TSJ Click here to see answer by guapa(62)

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