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

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Question 72237: How do you write a quadratic equation with integer coefficients that could represent the following solution:
x = -1 and x = 3
Click here to see answer by rmromero(383)

Question 72237: How do you write a quadratic equation with integer coefficients that could represent the following solution:
x = -1 and x = 3
Click here to see answer by jim_thompson5910(13787)

Question 72626: Solve the equation In(x+5) -In(3) =In(x-3).
Please show me how to break this down to where it would understand by a dummy like me.
Thanks to anyone who can help
Click here to see answer by Earlsdon(4898)

Question 72726: 1) Explain an advantage of rational exponents over the radical sign
2) Suppose you travel north for 35 kilometers then travel east 65 kilometers. How far are you from your starting point? North and east can be considered the directions of the y- and x-axis respectively. Round to the tenth's place
3)The volume of a cube is given by V = s3. Find the length of a side of a cube if the Volume is 729 cm3.

Click here to see answer by Earlsdon(4898)

Question 72681: The decible level of sound is given by D=10 log (I/10^-12, where I is the sound intensity measured in watts per square meter. Find the decible level of a whisper at an intensity of 5.4 ? 10-10 watts per meter.
Does anyone understand this? If so please break it down for me. Thanks to anyone who can help.
Click here to see answer by bucky(1732)

Question 73042: is sqrtx^2 an identity (true for all values of x?)
Click here to see answer by jim_thompson5910(13787)

Question 73056: which basic function is related to the arithmetic sequence.
which basic function is related to the geometric sequence.
Click here to see answer by stanbon(26259)

Question 73329: Find the slope of each line, and determine whether the lines are parallel, perpendicular, or neither:
a) 2x + 5y = 4; 4x + 10y = 1 My answer: Slopes are both -2/5; Parallel
b) 3x - 2y = 6; 2x + 3y = 3 My answer: Slopes are 3/2 and -2/3; Perpendicular
c) 5x - 3y = -2; 3x - 5y = -8 My answer: Slopes are 5/3 and 3/5; Perpendicular
Let me know if you need more info on how I came to my answers. These are from a homework assignment (from my teacher, not a book), which I don't think will count significantly toward my grade. I'm just curious if I got this right. I've been ill and missed some class, and my head's still woozy, so I just want to make sure I'm on-track, or whether I should try again. Thanks!
Click here to see answer by checkley75(3666)

Question 73661: i need to learn how to slove linear equations.
y=1/6x-3
how do i solve that?

Click here to see answer by checkley75(3666)

Question 74294: okay.
listen.
please.
i really don't get this stuff.

it says:
"What is the equation of the vertical line that passes through the point (0,4)?
Click here to see answer by funmath(2873)

Question 74297: Hey,
im the girl from before with the question about equations & such.
i still don't get it.
I put that answer in & it said it was wrong.
im not sure how to do this.
It gives me graphs to work it out on, but I still don't know how.
Please can you explain it too me once more.
Im sorry to keep bothering you, i just really want to understand this.
It says,
What is the equation of the vertical line that passes through the point (-1,-3)
THANKS!

Click here to see answer by jim_thompson5910(13787)

Question 74425: heyy.
okay
so i need help again.
heres the question..
Write an equation of the line through (-1, -2) and (-1, 1).
First, use the two points to find the slope.

HELP ME!!
hahaha
please!
Click here to see answer by josmiceli(3003)

Question 74729: Solve each of the following systems by addition. If a unique solution does not exist, state
whether the system is inconsistent or dependent.
x+5y=10
-2x-10y=-20

Click here to see answer by jim_thompson5910(13787)

Question 74728: Please help. I do not even know what to call this.
Solve each of the following systems by addition. If a unique solution does not exist, state whether the system is inconsistent or dependent.
2x+3y=1
5x+3y=16

Click here to see answer by jim_thompson5910(13787)

Question 74726: Find values for m and b in the following system so that the solution to the system is (-3, 4).
5x+7y=b
mx+y=22

Click here to see answer by jim_thompson5910(13787)

Question 75456: Find the linear factorization from the given zeros
Zeros: -1, multiplicity 1; 2, multiplicity 3; 4, multiplicity 2
Click here to see answer by jim_thompson5910(13787)

Question 76440: 8x - 2y = 16 the slope of this line is
Click here to see answer by checkley75(3666)

Question 76439: 8x - 2y = 16
Click here to see answer by checkley75(3666)

Question 76436: X-7/5-5/2=x+9/10
Click here to see answer by checkley75(3666)

Question 77114: Solve for b in the equation R = 6a²b.
Click here to see answer by checkley75(3666)

Question 77064: Sorry not sure what kind of algebra it is.
the question is from nov03 edexcel gcse paper, and tells us the area of a trapezium is 36cm^2
show that x^2-x-56=56, which i got to be,
1/2(a+b)h
=1/2(x+2+x+6)x-5
1/2(2x+8)x-5=36
x+4 multiplied by x-5
36 =x^2-20+4x-5
therefore x^2-x-56=0
is that right?
and then it asks you to solve the equation x^2-x-56=0
i've got so far
x^2-x=56
x^2=56+x
but i never know what to do next? please help!
Click here to see answer by jim_thompson5910(13787)

Question 77102: we're doing linear functions and linequalities in two variables using the points (3,-4) (-2,-4) need to find the slope M= y sub2 - y sub1 over x sub2 - x sub1 after finding the slope we use the formula y-ysub1=m(x-x sub1) Can anyone help please???
Click here to see answer by ankor@dixie-net.com(6691)

Question 77768: 3x=2y+7
5x=2y+13
Click here to see answer by mysterynorth(5)

Question 78207This question is from textbook

: im stuck and baffled
-x-5=5 whats up with that? i got 0 for an answer is that right?This question is from textbook

Click here to see answer by checkley75(3666)

Question 78641: 2346x + 2829y = 4272.42
What is x
What is y
Click here to see answer by checkley75(3666)

Question 78932: 5x-(2x+2)=x+(3x-5)
Could you help me to solve this problem?
Thank you
Click here to see answer by stanbon(26259)

Question 80139This question is from textbook Gateways to Algerbra and Geometry
: Find each sum.
A: 3 1/5 + {-4 3/5}
B: -6.8 + (-9.3)
C: -4 1/2 + 6 1/4This question is from textbook Gateways to Algerbra and Geometry

Click here to see answer by checkley75(3666)

Question 80231This question is from textbook elementary and intermediate algebra concepts and applications
: a=bx+cx solve for x This question is from textbook elementary and intermediate algebra concepts and applications

Click here to see answer by mathtutor777(6)

Question 80492: what is the solution to the system of equations?
2x-y+3z=8
x-6y-z=0
-6x+3y-9z=24
i thnk its either no solution or infinitely many solutions. im not sure.
thanks!!!!!
Click here to see answer by stanbon(26259)

Question 80731: 48: Solve this system:
y = 2x - 3
x + 2y = 14
Click here to see answer by jim_thompson5910(13787)

Question 80816: This is a question from a class homework assignment.
Given a line containing the points (1,3), (2,4), (3,5) determine the slope-intercept form of the equation, give one additional point on this line and graph function.
Equation of line in slope-intercept form:
show your work:
Give one additional point in (x,y) form that would fall on this line:
Graph the function:
Click here to see answer by funmath(2873)

Question 81511: x2 + 4x + 4 this can be solved by using the quadratic formula or by factoring. this is a perfect square with real and equal roots of 2
Click here to see answer by arisfernando(1)

Question 81508: write the eepression as a complex number in standard form (5 + 4i) + (-7 +9i)
Click here to see answer by mathdoc316(9)

Question 81507: 2
X + 4x + 4
Click here to see answer by rapaljer(3610)

Question 81532This question is from textbook college algebra with modeling and visualization

: Can you please help me do this problem. I really just don't know where to start.It is solutions to linear systems using matrices.
12x-4y-7z=8
-8x-6y+9z=7
34x+6y-2z=5
Can you show me how to do it step by step please. Thank you for your timeThis question is from textbook college algebra with modeling and visualization

Click here to see answer by longjonsilver(2297)

Question 81532This question is from textbook college algebra with modeling and visualization

Click here to see answer by Edwin McCravy(2920)

Question 81532This question is from textbook college algebra with modeling and visualization

Click here to see answer by rapaljer(3610)

Question 81544: can someone please! please! check this for me?
I am suppose to simplify
I hope i put this in the right section
3x
over
x-7
minus
21
over
x-7
answer
3x-21/x-7
3(x-7)/x-7
=3x/x-7
=21/x-7
Click here to see answer by tutor_paul(424)

Question 81722: Solve the system by addition.
5x – 9y = 16
x + 2y = –12

Click here to see answer by jim_thompson5910(13787)

Question 81590This question is from textbook

: Solve the simultaneous equation
4x+y=22
x+4y=16This question is from textbook

Click here to see answer by jim_thompson5910(13787)

Question 82222: I don't know if this one falls into this category or not, but could someone help me please?
Solve the system by addition
5x+9y=-12
x-2y=-10
Click here to see answer by jim_thompson5910(13787)

Question 82274This question is from textbook beginners algebra

: I am desperate, this is systems by addition. it says state whether the system is inconsistent or dependent.
2x+3y=1
5x+3y=16This question is from textbook beginners algebra

Click here to see answer by jim_thompson5910(13787)

Question 82279This question is from textbook
: Find the x-intercept and y-intercept of the equation.
28. y+6=5xThis question is from textbook

Click here to see answer by checkley75(3666)

Question 82374: This summer there were 867 campers at a basketball camp. Most of the campers wore "Air Jordan" shoes, but some wore "Ground McCombs" shoes. A pair of Air Jordans cost $160.95 at Finish Line. A pair of Ground McCombs cost $14.25 at Wal-Mart. The campers spent a total of $127,220.85 on shoes. How many campers wore Ground McCombs shoes?
Click here to see answer by askmemath(368)

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