# 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 34952: can you help me solve this problem? rh^2-ph+q=0 solve for h this is what i have so far rh^2-ph=-q h(hr-p)=-q ? Click here to see answer by stanbon(57282)

 Question 35932: Im not sure what they want me to do. Find g(9) given that g(x) = 2x + 3 Click here to see answer by rapaljer(4667)

 Question 36201: I need help solving these problems with complex numbers write the sum as a complex number in standard form (-5+5i)+(-2-3i) and (-3+5i)(-4+3i) Click here to see answer by Prithwis(166)

 Question 36295: how would I solve this problem to simplify for like terms? 3(4x+6)+7x Click here to see answer by checkley71(8403)

 Question 36284: add and simplify: y over y^2-49 + 7 over y^2+8y + 7 show work Click here to see answer by rapaljer(4667)

 Question 36529: Please show me how to figure this out... I need to find the x-value of x-2y=-6 y=3x-2 A)x=1 B)x=2 C)x=4 D)x=4/5 thanks! Click here to see answer by vidhyak(94)

 Question 36995: x=y-4 2x+8=2y solve using elimination, substitution or graphing could this be no solutions? Click here to see answer by checkley71(8403)

 Question 37239: Solve each of the following systems by substitution. 5x – 2y = -5 Y – 5x = 3 Click here to see answer by checkley71(8403)

 Question 37349: Please help..how do i work this problem. I have to factor the numerator and denominator as completely as possible, then divide out all the like factors (one for one) in numerator and denominator. ``` 25x —————-———— 10x + 15 Please show me the details of getting the answer so i may understand how it is done. Thank you, Sean``` Click here to see answer by AnlytcPhil(1276)

 Question 37387: If 3x+y=6, then what is y? Please show us how you are doing this so we can figure it out. Thank you Click here to see answer by fractalier(2101)

 Question 37390: 3a+6b=-15 a=-2b-5 Use the substitution method to solve the system. If its dependant or inconsistant, so indicate. Click here to see answer by fractalier(2101)

 Question 37395: r+3s=9 3r+2s=13 Use substitution method to solve system. If its dependant or inconsistant, so indicate Click here to see answer by fractalier(2101)

 Question 37398: 2a=3b-13 b=2a+7 Use substitution method to solve system . If system is dependant or inconsistant so indicate. Click here to see answer by fractalier(2101)

 Question 37405: x-2y=2 2x+3y=11 use substitution method to solve system if dependant or inconsistant please indicate Click here to see answer by fractalier(2101)

 Question 37407: 5u+3v=5 4u-v=4 use substitution method to solve system if dependent or inconsistent, so indicate Click here to see answer by checkley71(8403)

 Question 37403: x-2y=2 2x+3y=11 use substitution method to solve system if dependant or inconsistant so indicate Click here to see answer by checkley71(8403)

 Question 37412: a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a? please show me the work so i can understand how to do it myself Click here to see answer by checkley71(8403)

 Question 37411: a=b+3(4-c) if b equals 5 and c equals 2, what is the value of a? Click here to see answer by fractalier(2101)

 Question 37245: Solve each of the following systems by substitution. 4x – 12y = 5 -x + 3y = -1 Click here to see answer by fractalier(2101)

 Question 37396: Is there a formula that could be used to explain how you add consecutive numbers to make multiples of 100.eg.18+19=19=20=21=22=100 38+39+40+41+42=200 that would be suitable for a twelve year old to be able to solve such problems? Click here to see answer by checkley71(8403)

 Question 37342: Lisa Chen invested \$24,000, part of it at 8% and the rest at 7.2%. How much did she invest at each rate if her income from the 8% investment is 2/3 that of the 7% investment? This is a multiple choice question so by inserting different answers I was able to figure out that the answers are \$15,000 at 7.2% and \$9,000 at 8%. I still don't know how to do the problem though. Please help me with this one. Thanks!! Click here to see answer by checkley71(8403)

 Question 37309: help me with the substitution method word problems. ---------------------------------------------------- Mrs. brighton invested \$30,000 and received \$2300.00 in interest. If she invested part of the money at 10% and the remainder at 5%, then how much did she invest at each rate ? --------------------------------------------------------------------------- tickets for a concert we're sold to adults for \$3.00 and to students at \$2.00. If the total receipts we're \$824.00 and twice as many adult tickets as student tickets we're sold, then how many of each we're sold ? Click here to see answer by checkley71(8403)

 Question 37589: Can someone help me with these questions please? A principal of \$5000 was invested in a savings account for 4 years. If the interest earned for the period was \$400, what was the interest rate? Allen bought 20 stamps at the post office in 37¢ and 20¢ denominations. If the total cost of the stamps was \$7.06, how many 37¢ stamps did Allen buy? The perimeter of a rectangle is to be no greater than 300 in., and the length must be 125 in. Find the maximum width of the rectangle. One number is 8 less than another. If 5 times the smaller number minus 2 times the larger number is 14, find the two numbers. Click here to see answer by Nate(3500)

 Question 37609: How do I Solve the system by graphing. 4x + 4y = 4 x + y = 1 Click here to see answer by Nate(3500)

 Question 37628: Here is a word problem that involves the vertical motion formula of h=-16t^2 + vt +s. The problem is if a person on a creek bed throws a rock straight up at a speed of 64 feet per second. 1) when will the rock reach a maximum height? 2) when will the rock hit the water again? This is how I have satrted: I used the formula by putting 64 in the v spot and 0 in the s spot because I started at 0. It looks like this h=-16t^2 + 64t +0. I worked it out and got 2(1+-1) =t so my answer would be t=0 and t=4 If that is right then would the answer to #1 be half of that which is 2 seconds and the answer to #2 would be 4 seconds when it hits the water again. Am I on the right path or am I totally off? Click here to see answer by Earlsdon(6287)