# 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 192356: if y=8x^2 + 4x-1 is expressed in the form y=a(x-h)^2+k, where a, h, and k are constants, what is the value of k ? Click here to see answer by Mathtut(3670)
 Question 192356: if y=8x^2 + 4x-1 is expressed in the form y=a(x-h)^2+k, where a, h, and k are constants, what is the value of k ? Click here to see answer by RAY100(1637)

 Question 192475: Translate the following phrase into an algebraic expression. Five, subtracted from three times a number. Click here to see answer by nerdybill(7009)

 Question 192487: h/2 + h/5= 14 I can't find how to simplify the equition Click here to see answer by RAY100(1637)

 Question 192809: Given Year 1, Year 2, Year 3, with an average between all three of \$2,400,000. Year 2 has a 4% increase over Year 1 and Year 3 has a 4% increase over Year 2, what is the dollar amount for each year? Does anyone know how to work this out? Your help would be greatly appreciated. Click here to see answer by edjones(7569)

 Question 192808: Given Year 1, Year 2, Year 3, with an average between all three of \$2,400,000. Year 2 has a 4% increase over Year 1 and Year 3 has a 4% increase over Year 2, what is the dollar amount for each year? Does anyone know how to solve this, the answer cannot be "x" because I need the number to be able to work through the rest of the problem. Your help would be greatly appreciated thank you! Click here to see answer by edjones(7569)

 Question 193052: THIS PROBLEM IS FROM CHAPTER 6 CHAPTER TEST PROBLEM 20 7/Y-1/3=1/4 MY TEACHER DID NOT EXPLAIN THE STEPS IN SOLVING THIS PROBLEM. Click here to see answer by ankor@dixie-net.com(15746)

 Question 191164: Please help me solve this substitution problem. 3(x-y)=15 2x+y=7 The question I have is does it matter which equation I use as the substitution? I used the 2nd equation and came up with a different answer than with the first. First solution: 3(x-y)=15 2x+y=7 y=7-2x 3(x-7-2x)=15 3x-21-6x=15 -3x=36 x=-12 y=7-2x y=7-2(-12) y=31 Second solution: 3(x-y)=15 3x-3y=15 2x+y=7 3x=15+3y x=5+y 2(5+y)+y=7 10+2y+y=7 3y=-3 y=-1 x=5+y x=5+-1 x=4 which is correct and how do I know which equation to start with on these types of problems? Click here to see answer by MathTherapy(1484)

 Question 193223: Could you please help me with this question? Two cars travel toward each other from cities that are 945km. apart at rates of 120km/hr and 90 km/hr. They started at the same time. In how many hours will they meet? Thank you for your help. Click here to see answer by jonvaliente(64)

 Question 193572: Redcue the rational expression to lowest terms, if possible. x^2-8x+16 x-4 Click here to see answer by jim_thompson5910(28717)

 Question 193624: Two cars leave a restaurant at the same time and travel in opposite directions. One averages 50 miles per hour and the other averages 40 miles per hour. After how long will they be 216 miles apart? Click here to see answer by stanbon(57982)

 Question 193670: The sum of two numbers is 50. If twice the larger is subtracted by 4 times the smaller, the result is 8. Find the numbers. Click here to see answer by orca(409)

 Question 193695: simplify the expression. write the result using positive exonents only. (2x^3)^(-4)/(x^15) Click here to see answer by Mathtut(3670)

 Question 193739: if -1/3x+7=16, what is the value of 2x+1? the answer is -53 but how do you get it. Click here to see answer by jojo14344(1512)

 Question 193738: if -1/3x+7=16, what is the value of 2x+1? Click here to see answer by user_dude2008(1861)

 Question 193693: simplify the expression. write the result using positive exonents only. (2x^3)^(-4)/(x^15) Click here to see answer by stanbon(57982)

 Question 193669: The sum of two numbers is 50. If twice the larger is subtracted from 4 times the smaller, the result is 8. Find the numbers. Click here to see answer by checkley77(12569)

 Question 193856: can u help me with this with simple step by step instructions: 3x+y=5 y=x-7 Click here to see answer by edjones(7569)

 Question 194535: Solve the nonlinear system of eqautions. 4x^2-2y^2=2 -x^2+y^2=2 Click here to see answer by RAY100(1637)

 Question 194697: 5. Solve for y: -0.9y – 1.2 = 2.4 6. Write the phrase as a mathematical expression. Sixteen increased by 8 times a number is 88. Click here to see answer by checkley77(12569)

 Question 194696: 1. Evaluate -3x^2 – 4x + 1 when x = -2 2. Solve for x: 3x - (x+6) = 5x + 6(2 - x) 3. S = 2hw + 2lw + 2lh; determine l when S = 122, h =4, and w = 3 4. Solve equation for a: p = a + b + c Click here to see answer by checkley77(12569)

 Question 194899: I'm very confused about this problem, so I really hope someone can help me. I dont know how to type this and I looked at the fourmula plotting system but couldnt find anything, so I will try to explain it the best I can. I have to write an expression for the following. y+y+...+y (then there is a curly bracket under it making it look like a fraction(except that its a curly bracket) and under the bracket is the following) x of them Click here to see answer by jim_thompson5910(28717)

 Question 194960: I NEED HELP TO LEARN HOW TO SIMPLIFY THIS EQUATION X SQUARED+8X+15 DIVIDED BY X SQUARED +5X+6 Click here to see answer by jim_thompson5910(28717)

 Question 190191: Can you help me solve this problem: ax/c2(b4/xk-2b2) Click here to see answer by Alan3354(31537)

 Question 195044: S15,000 invested some at 8% and some at 10# to yield \$1,375 in iterest. How much was invested on each? Click here to see answer by checkley77(12569)

 Question 195272: Without drawing the graph of the equation, determine how many points the parabola has in common with the x-axis and whether its vertex lies above, on, or below the x-axis. y = 3x2 - 12x + 12 Click here to see answer by Edwin McCravy(8999)

 Question 195270: Without drawing the graph of the equation, determine how many points the parabola has in common with the x-axis and whether its vertex lies above, on, or below the x-axis. y = 2x^2 + x + 3 Click here to see answer by J2R2R(94)