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

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Algebra: Expressions involving variables, substitution

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Question 17510: I am having problems making this into an equation...
Kevin is 5 years older than Lisa. Four years ago, Kevin was twice as old as Lisa was then. How old is Kevin now?
My work:
Kevin Now: X+5
Lisa Now: X
Kevin Then: 2x-4
Lisa Then: X-4
Equation: 2X+5=3X-8
Coming out with wrong answer of 13; Supposed to be 14. Thanks!
Click here to see answer by venugopalramana(3286)

Question 17545: 3x=27-15x
Click here to see answer by pwac(251)

Question 17545: 3x=27-15x
Click here to see answer by Alwayscheerful(414)

Question 17577: Simplify 4(a + b) - 3b + a
Click here to see answer by pwac(251)

Question 17577: Simplify 4(a + b) - 3b + a
Click here to see answer by Alwayscheerful(414)

Question 17579: What is the solution to 3a + 2 = 7 ?
Click here to see answer by pwac(251)

Question 17579: What is the solution to 3a + 2 = 7 ?
Click here to see answer by Alwayscheerful(414)

Question 17578: simplify 3.2a - 5.6b + 6a - 4.3b
Click here to see answer by pwac(251)

Question 17570: Solve -5x = -9.5
Click here to see answer by pwac(251)

Question 17569: Solve: 7(x - 1) = -14
Click here to see answer by pwac(251)

Question 17569: Solve: 7(x - 1) = -14
Click here to see answer by Alwayscheerful(414)

Question 17566: Simplify: (-3)(6)(-2) - 8 + 4 + 3(6)
Click here to see answer by whisper(27)

Question 17576: Evaluate b^2 -4a when a = -1, b = -3
Click here to see answer by whisper(27)

Question 17568: Simplify 2 + (8 - 10)/ 2
Click here to see answer by whisper(27)

Question 17596: I need help with this problem. I am not sure if this problem falls under the category I put it in but I don't really know the category it is in:
1-2/3y=12/5-y/5
Click here to see answer by whisper(27)

Question 17567: Evaluate e + 2f - g when e = -2, f = 4, g = -6
Click here to see answer by piglet162431(90)

Question 17815: 25-7*n=17
Click here to see answer by venugopalramana(3286)

Question 17813: -3(-4x+2),use the disrtubutive property to write the expression without parentheses.then siplify, if necessary.

Click here to see answer by venugopalramana(3286)

Question 17899: whats 100=4b
Click here to see answer by pwac(251)

Question 17899: whats 100=4b
Click here to see answer by whisper(27)

Question 17899: whats 100=4b
Click here to see answer by Alwayscheerful(414)

Question 17898: 60=2h-7+2h+7
Click here to see answer by pwac(251)

Question 17917: how to work this promblem 3x-1=11
Click here to see answer by whisper(27)

Question 17917: how to work this promblem 3x-1=11
Click here to see answer by Alwayscheerful(414)

Question 17269: what is 5y-10+-3y, and teh steps to solve it?
thank you
Click here to see answer by kunal_122(19)

Question 18065: 2x+8=x+9
Click here to see answer by tennis_math(7)

Question 18065: 2x+8=x+9
Click here to see answer by tutor4u(2)

Question 18065: 2x+8=x+9
Click here to see answer by Alwayscheerful(414)

Question 18221: What is 9a+2b=c+4a when you have to solve for a?
Click here to see answer by Kuroinu(8)

Question 18301: If 4a²-b²=54, then 4(2a+b)(2a-b)= ?
Thanks.
Click here to see answer by Earlsdon(4898)

Question 18323: how do you solve 2m=1-m
Click here to see answer by venugopalramana(3286)

Question 18323: how do you solve 2m=1-m
Click here to see answer by Alwayscheerful(414)

Question 18419: please help me solve this equatition
-2m=-16m-9
Click here to see answer by Alwayscheerful(414)

Question 18419: please help me solve this equatition
-2m=-16m-9
Click here to see answer by mmm4444bot(95)

Question 18408: -3/8t=0
Click here to see answer by piglet162431(90)

Question 18408: -3/8t=0
Click here to see answer by Alwayscheerful(414)

Question 18602: 7g+14-5g=-8
Click here to see answer by Alwayscheerful(414)

Question 18578: the formula A= 1/2bh gives the area A for a triangle
Solve for H
Solve for B
Find H if B= 10in A= 80in2
Click here to see answer by wuwei96815(245)

Question 18727: Simple Interest: I can do the math if I knew how to set this up I think. I have setup this problem by pluging in the numbers but I get a different answer than my book answer key. Can you show me how to do this prblem please?
I=prt p=7500, r=.035, t=6
Click here to see answer by venugopalramana(3286)

Question 18769: y = -3x + 1, what is y when x = 3
Click here to see answer by momentten(3)

Question 18296: what is the answer to the equation 9-14x=51
Click here to see answer by momentten(3)

Question 19116: Evaluate the algebraic expression:
11v + vw^2 - w when v=12 and w = -3
I came up with 243, my college tutor came up with something different. Is this correct?
Click here to see answer by Alwayscheerful(414)

Question 19129: 4(4-w)=3(2w+2)
Click here to see answer by Alwayscheerful(414)

Question 19131: 3(d-8)-5=9(d+2)+1
Click here to see answer by Alwayscheerful(414)

Question 19042: 3-3x=-6
Click here to see answer by Alwayscheerful(414)

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