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

Tutors Answer Your Questions about Linear Algebra (FREE)

Question 606873: < does this mean you shade above or under the line ?
And what does this one mean too ? >
Click here to see answer by richard1234(7193)

Question 608299: how do i solve y is greater than or equal to negative 4?

Click here to see answer by Alan3354(69443)

Question 608520: What is the equation of the line that has an x-intercept of −5?

Click here to see answer by flame8855(424)

Question 608556: show that e^x and e^2x are independent.
Click here to see answer by ewatrrr(24785)

Question 608556: show that e^x and e^2x are independent.
Click here to see answer by solver91311(24713)

Question 609099: -3(4-x)=5-(x+1)
Click here to see answer by ewatrrr(24785)

Question 609360: solution for
y=x
y=-x+2
using the substitution method
Click here to see answer by flame8855(424)

Question 609592: i need help on equation and inequality
Click here to see answer by solver91311(24713)

Question 610134: determine whether the equation 3x - 4y = 0 is linear in the variables x and y.
Click here to see answer by Alan3354(69443)

Question 610150: square root of x+10 -7= negative 5

Click here to see answer by flame8855(424)

Question 611367: how do I rewrite the quadratic equation y=x^2+6x-8 in vertex form
Click here to see answer by solver91311(24713)

Question 611592: 7y-6(y-1)+3=9
Click here to see answer by lynnlo(4176)

Question 612677: what is the end behavior of y=x
Click here to see answer by stanbon(75887)

Question 613046: 14x^3 + 21x^2 + 16x + 24
please help me
Click here to see answer by jim_thompson5910(35256)

Question 613837: An airplane flying against the wind travels 242 miles in the same time that it can travel 253 miles with the wind. If the wind sped is 15 miles per hour, what is the speed of the airplane in still air ?
Click here to see answer by mananth(16946)

Question 614000: A boat travels 120 km downstream in 4 hours and takes 6 hours to return. How long will it take in still water?
Click here to see answer by ankor@dixie-net.com(22740)

Question 614444: Consider the linear function f(x)=A(x-B)+C. Discuss all the changes in the graph as A,B,and C change from positive,negative,zero, as well as, grow smaller or larger. Discuss the domain and range of linear functions.
Click here to see answer by josmiceli(19441)

Question 614521: the line passing through points (x,4)and(4,-5) is perpendicular to a line with a slope of -7/3.Which is the value of x?
Click here to see answer by ewatrrr(24785)

Question 615518: Solve:
3x-2(x-1)=x-6
I came up with x+2=x-6 which means no solution and got it wrong. Please help with the steps.
Click here to see answer by jim_thompson5910(35256)

Question 617525: 180 students are graduating from Johnson HS. If the ratio of the grils to boys is 5:4, how many boys are in the class
Click here to see answer by Maths68(1474)

Question 617524: 80 students are graduating from Johnson HS. If the ratio of the grils to boys is 5:4, how many boys are in the class
Click here to see answer by Maths68(1474)

Question 617535: fourteen cans of pet food cost 9.60 the cat cost .60 the dog cost 0.75 how many cans of each were purchased

Click here to see answer by Greenfinch(383)

Question 619156: find the slope-intercepts equation of the line with the following properties: parallel to the line x=4 ; containing the point (-7,7)
Click here to see answer by nerdybill(7384)

Question 619373: let a = -5a1 + 4a2
-8a1 + 7a2
find :
13
A .
Click here to see answer by Alan3354(69443)

Question 619657: What is the slope of this line 3x+y=4?
Click here to see answer by varun(12)

Question 619809: Two baseball players hit 79 home runs combined last season. The first player hit 7 more home runs than twice the number of home runs the second player hit. How many home runs did each player hit?
Click here to see answer by ewatrrr(24785)

Question 619971: fix it fast plumbing charges $25 for a house call and $50 for each hour spent on the job. do it right plumbing charges $35 for a house call and $45 for each hour spent on the job. how many hours must be spent on the job in order for the charges of the two plumbingcompanies to be equal?

Click here to see answer by dragonwalker(73)

Question 620121: Consider the system of equations: x + y + z = 210; x + z = 230; x + y = 120 What is the value of x?
Click here to see answer by ewatrrr(24785)

Question 620746: x+2y=4
2x-3y=1
Click here to see answer by lynnlo(4176)

Question 620787: 0=7x
Click here to see answer by Alan3354(69443)

Question 620867: when combining like terms and simplifying expression what is the answe to this problem or how do I work it out? -9(6m-3)+6(1+4m)

Click here to see answer by ewatrrr(24785)

Question 620956: I need to slove for x, but I dont know how, can you help me please?
3x+9<4(-5)-x+3+2x
3(2x-4)-4x+7<9
5|2x-5|-3=12
3}2x-5|>21
and also
5*2-9+2*4(2-(-3))
Click here to see answer by solver91311(24713)

Question 621521: Find the slope of the line.
2x - 5y = -24

Click here to see answer by Alan3354(69443)

Question 621523: Write the equation of the line with the given slope and y-intercept.
slope 2/3 ;

Click here to see answer by Alan3354(69443)

Question 621520: What is true about the line that passes through the points (3, -7) and (3,2)? please help me
Click here to see answer by Alan3354(69443)

Question 621524: Graph the equation by finding the slope and y-intercept.
x + 7y = -7

Click here to see answer by math-vortex(648)

Question 621818: solve the system of equations by the addition method
-3y-y=3
9x+y=3
Click here to see answer by Alan3354(69443)

Question 622252: what are the answers to:
1.n/3+5=7
2. 3n+5=23
Click here to see answer by lynnlo(4176)

Question 623243: If
f(x) = {-2x - 6, if x > 2 and x - 4, if x < 2}
what is f (3)?

Click here to see answer by ewatrrr(24785)

Question 623380: (x-9) (x-9)= x2-81
-how did you find the factors of x2-81?
Click here to see answer by Alan3354(69443)

Question 623912: What can be said of points lying on the line bisecting the 2nd and 4th quadrant?
Click here to see answer by ewatrrr(24785)

Question 624233: A line that passes midway between and is parallel to both x - y = 6 and x - y = -6.

Click here to see answer by Alan3354(69443)

Question 271464: what is the product of 7 and -3?
Click here to see answer by lenny460(1073)

Question 624750: Assume that all matrices are invertible and solve for the matrix X in:
(A^-1 X)^-1 =A (B^-1 A)^-1
Click here to see answer by jim_thompson5910(35256)

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