Questions on Algebra: Linear Algebra (NOT Linear Equations) answered by real tutors!

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Question 236240: y=-3x-2
Click here to see answer by checkley77(6671)

Question 236000: linear Systems-Mixed Methods
4x+y=3.4
x=4y
Click here to see answer by solver91311(4818)

Question 235805: solve -6+4y-8
Click here to see answer by rfer(2588)

Question 234341: You save money from a job. You invest some of it in a cd account that yields 8% interest yearly and the rest in a bond that yields 6% interest yearly
C=the amount of money invested in the cd and B=the amount invested on the bond. You earn $84 interest in a year
Write an equation relating C,B and the amount of money earned
Click here to see answer by checkley77(6671)

Question 234205: A motorboat can go 14 miles downstream on a river in 20 minutes. It takes 30 minutes for this boat to go back upstream the same 14 miles. Find the speed of the current.
Click here to see answer by checkley77(6671)

Question 233920: what is 2x+4=4x-6
Click here to see answer by rfer(2588)

Question 233625: Hello, i am having trouble figuring out how to solve for (h) in the problem A=1/2h(a+b)!!! Thanks

Click here to see answer by stanbon(25959)

Question 233554: y= x2 + 4x - 7
what is the :
y - intercept
x - intercept
turning point
please write down the solution as well, thanks
Click here to see answer by edjones(3194)

Question 233393: Using long division of polynomials can you please solve this equation, and also explain the process(11x^4-12x^3+15x^2+13x+14)/ x^2-6. Thanks
Click here to see answer by solver91311(4818)

Question 232262: the computer club invested $2200, part at 4.5% interest and the rest at 7%. the total annual interest earned was $144. how much was invested at each rate?
Click here to see answer by rfer(2588)

Question 232149: can somebody help me on four questions please
Click here to see answer by rfer(2588)

Question 231939: Solve by substitution.

x-y=6
x=y+2

Click here to see answer by checkley77(6671)

Question 231844: Find the slope (-5,-18)(-9,-19)
Click here to see answer by unlockmath(60)

Question 230443: one number is 10 times larger as another, and their difference is 81. find the numbers.
Click here to see answer by Alan3354(5863)

Question 230349: C=5/9(F-32)for F. Solve the formula for the given variable
Click here to see answer by rfer(2588)

Question 230248: My question is calculating D=sqrt(2h). D representing how many miles a person can see the horizon from a height, h in feet. Find the corresponding distance you should be able to see the horizon. Include height and the calculations.
D=sqrt (2h)
D= sqrt2(800)
[D=sqrt1600]^2
D=40 miles a person can see the horizon.
I was just wondering if I did this correctly? Thank you
Click here to see answer by solver91311(4818)

Question 230253: Just wondering if I did this problem right? Thank you for checking.
The city mileage is 17 mpg and the highway is 26 mpg (“kbb“, 2009). Taking this in mind, we are going to find out how many miles we can go with 50 gallons of gas, where x equals the number of miles driven.
17=x/50
17*50=x
x=850 city miles on a tank of gas equaling 50 gallons.
Check: 850÷50=17
26=x/50
26*50=x
x=1300 highway miles on a tank of gas equaling 50 gallons.
Check: 1300÷50=26
Click here to see answer by solver91311(4818)

Question 230022: what is the question find f(x) + g(x)and f(x) - g(x). Simplfy your answer asking you to do ?
Click here to see answer by stanbon(25959)

Question 229422: In my year 5 class of 30 children some students play tennis, some play basketball, some play both sports and some do not play either sports. How many students play both sports if 18 play tennis, 15 play basketball and 4 do not play either sport?
Click here to see answer by edjones(3194)

Question 228940: how do i do this x-14=-y
x- y= 2
Click here to see answer by stanbon(25959)

Question 228736: What is 2x-y+z=14
-x+2y-4z=5
x+4y-6z=-1
This is solve the system using the elimination method get the x,y, and z please help this is hard.
Click here to see answer by ankor@dixie-net.com(6567)

Question 228718: x-intercept= 1/3,y intercept= 1/4
slope= -3/4
Click here to see answer by user_dude2008(690)

Question 227928: Suppose the length of a rectanle is 3cm longer than twice the width and that the peimeter is 90cm. Setup an equation for the perimeter involving only W the width. solve this equation algebraically to find length and find the width as well?
Click here to see answer by checkley77(6671)

Question 227588: Using the formula A=LP/2-L^2 the question is how do you determine what numbers to choose for two different problems when trying to fence 600 feet?
Click here to see answer by rapaljer(3526)

Question 227586: 9x-y, for x=10 and y=3
9x-y=? when x=10 and y=3
Click here to see answer by Alan3354(5863)

Question 227117: Solve algebraically.
x-3y-3z=0
2x+5y-5z=1
-x+5y-6z=-9
I got z=1 x=3 and y=0. But I'm not sure if this is correct. Can someone please check?
Click here to see answer by Theo(549)

Question 226814: write an equation in slop intercept form? y-3x=1 and 3x-10-5y=0
Click here to see answer by rfer(2588)

Question 225050: i dont understand how what to do with this slope equation -3,(5,8)
Click here to see answer by LtAurora(115)

Question 225027: Solve by using elimination. This cant be solved right?

x-4y=2
4x-16y=8
Click here to see answer by drj(1380)

Question 224436: If what is the value of x?
Click here to see answer by LtAurora(115)

Question 224442: Suppose you need to solve a system of equations in which both equations represent lines. How many solutions can your system have?
How many solutions does the following equations have?
8x+4y=8
2x-2y=-4
Click here to see answer by drj(1380)

Question 224440: Suppose you need to solve a system of equations in which both equations represent lines. How many solutions can your system have?
How many solutions does the following equations have?
8x+4y=8
2x-2y=-4
Click here to see answer by drj(1380)

Question 224017: The sum of twice a first number and five times a secod number is 92. If the second number is subtracted from five times the first number the result is 14. find the numbers.
Click here to see answer by drj(1380)

Question 223705: I REALLY NEED HELP=(
OK SO I HAVE ALGEBRA 2 IN THE PROBLEM IS
FIND X,Y,AND P. PLEAS HELP=)
Click here to see answer by ankor@dixie-net.com(6567)

Question 223239: log (x2y4/z3)
log8 (x3y4/z5)
log2 (x/y2z3)
logx243=5
Click here to see answer by stanbon(25959)

Question 222909: i need help on solving this problem 4x+7y=28, y=2x-14
Click here to see answer by stanbon(25959)

Question 222140: write an equation for each line
1. y-intercept of -2.1, x-intercept of 3.5
2. through (1.2,5.1), x-intercept of 3.7
Click here to see answer by solver91311(4818)

Question 221684: I need help with this problem:
w=1/√(LC)
Solve for C

Click here to see answer by rfer(2588)

Question 220740: what is the step for solving:
x+y=4
x+z=4
y+z=4
Click here to see answer by Alan3354(5863)

Question 220647: what is the answer to the problem
Suppose f(x)=4x-2andg(x)=-2x+1
Click here to see answer by stanbon(25959)

Question 220624: You worked 14 hours last week and earned $96 before taxes. Your job as a lifeguard pays $8 per hour, and your job as a cashier pays $6 per hour. How many hours did you work at each job?
Click here to see answer by likaaka(51)

Question 220129: if the y intercept is -4 and the points are (2,2)
Click here to see answer by checkley77(6671)

Question 220108: A lanscaper balances his daily projects between small landscape jobs and mowing lawns. He allows 30 minutes for per lawn and 90 minutes per small landscape job. He works at most ten hours per day. The landscaper earns 35 per lawn and 125 per small landscape job. He can not do more than three landscape jobs per day and get all his mowing done. Find a combination of lawns mowed and completed landscape jobs per day that will maximize his income.
This is linear programming i really dont get this problem please help
Click here to see answer by Theo(549)

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