Questions on Algebra: Systems of Linear Equations answered by real tutors!

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Question 440885: Solve by elimination
5x + 5y = -7
7x - 2y = 19
If all work could be shown (even the simplest) it would be very appreciated.
I am having trouble figuring out how to simplify 80/10 down to 16/5.
Thank you!
Click here to see answer by stanbon(75887)

Question 441063: 4x −4 > −2x +8
Click here to see answer by stanbon(75887)

Question 441459: I need to understand the formula to get the right answer.
example,
if 8y + 11 = 2y + 29, what does y =?
Click here to see answer by nerdybill(7384)

Question 441548: Again, I know there is not a section, but can anyone help with the following problem please?
Find the equation of the tangent line to the curve when x has the given value.
f(x) = x2 + 5x ; x = 4
Click here to see answer by josmiceli(19441)

Question 442111: .lmmjmjghhvhhjhjhhhjhjhj

Click here to see answer by rwm(914)

Question 442236: how many ordered pair solutions exist for the equation y=x+273
Click here to see answer by stanbon(75887)

Question 442408: x+y=3
2x-3y=16
Click here to see answer by swincher4391(1107)

Question 442407: -5x+3y=6
x-y=4
Click here to see answer by ewatrrr(24785)

Question 442406: y=3x+2
y=4x-1
Click here to see answer by ewatrrr(24785)

Question 442405: x-y=2
5x+3y=18
Click here to see answer by rwm(914)

Question 442562: Y=3x+2
y=4x-1
Click here to see answer by rwm(914)

Question 442725: solve the system by the substitution method.
15x-y=51
y=x^2+5
Click here to see answer by stanbon(75887)

Question 442865: I hate to ask, but is there anyone that can proofread my algebra work? I'm not looking for the answers, but for someone to point out which ones I need to look at again. I'm pretty sure of my work but I'm nervous to turn it in because it counts for so much of my grade. Thank you!
Click here to see answer by scott8148(6628)

Question 442756: A labourer is engaged for 20 days on the condition that he will receive for Rs. 60 for each day he
works and will be fined Rs. 5 for each day he is absent. If he receives Rs. 745 in all, for how many
days did he remain absent
Click here to see answer by ankor@dixie-net.com(22740)

Question 442979: solve by the substitution method,whats the solution of system 4x + 5y =13 and -6x +y =57
Click here to see answer by swincher4391(1107)

Question 442979: solve by the substitution method,whats the solution of system 4x + 5y =13 and -6x +y =57
Click here to see answer by MathLover1(20850)

Question 443467: How do you solve this equation and put it into slope intercept form: 2=y

Click here to see answer by rwm(914)

Question 443509:

Solve by the elimination method. what is the solution?
Click here to see answer by MathLover1(20850)

Question 443833: What is the equation for the depth of 10 feet but water level dropping at a rate of 1/2 inch a week?
Click here to see answer by Alan3354(69443)

Question 444087: One type of candy sells for $2 per
pound, and another type sells for $3 per pound. An
order for 18 pounds of candy costs $47. How much of
each type of candy was bought?
Click here to see answer by edjones(8007)

Question 444048: -5xy+2z=2w for y
Click here to see answer by edjones(8007)

Question 444219: I am having trouble simplifying this {12+[6(9x+2y)]}-[8(4x+19y)]
Click here to see answer by stanbon(75887)

Question 444218: I am having trouble simplifying this. {12+[6(9x+2y)]}-[8(4x+19y)]

Click here to see answer by stanbon(75887)

Question 444275: the linear model C=400x+30000 represents the cost in dollars a company has in manufacturing x items during a month. based on this, how much does it cost to produce 700 items?
Click here to see answer by jorel1380(3719)

Question 444501: how do you solve
4x=6-2y
6x+3y=-9
Click here to see answer by solver91311(24713)

Question 444501: how do you solve
4x=6-2y
6x+3y=-9
Click here to see answer by josmiceli(19441)

Question 444545: Write the slope-intercept equation for the line with slope -3/7 and y-intercept (0, -5) and graph the line.

Click here to see answer by rfer(16322)

Question 444548: 3x-y=3
5x+2y=4
Click here to see answer by stanbon(75887)

Question 444552: is y=-x a linear equation
is y=1/2x-3 a linear equation
is y=1/x a linear equation
is y=xsquared+1 a linear equation
is y=6.7x-9 a linear equation
Click here to see answer by stanbon(75887)

Question 444550: Which of the following points are solutions to: x+2y<-12, 3x-y>=-2
(-1,-5) (0,0) (1,-7)
Thank you!
Click here to see answer by rwm(914)

Question 444566: Give an equation whose solution set is the line joining (2,3) and(-4,6) What is its equation in slope-intercept form?
Click here to see answer by stanbon(75887)

Question 444622: m=3(6,2)
write the slope intercept equation for the line the given slope
Click here to see answer by oberobic(2304)

Question 444683: Find the x- and y- intercepts for the graph of the following equation.
7x + 6y = 126
Click here to see answer by robertb(5830)

Question 444385: Rewrite the parametric equations as a single linear equation x = - t , y = 3 t - 1

THANKS So very much
Click here to see answer by richard1234(7193)

Question 444819: write the slope intercept equation for the line with slope 4/5 and y intercept(0,-1)
Click here to see answer by josmiceli(19441)

Question 444820: y=5/6x-14
find the slope and y intercept
Click here to see answer by josmiceli(19441)

Question 444982: how do I find the value of y in the equation 3x-y=8 in table form
3x-y=8
Use the values of x provided in the table.
x y
0
1
2
3
4

Click here to see answer by checkley79(3341)

Question 445237: I believe this topic explains it best, i need to solve the system using the elimination method. I have tried several times, and I feel like there is no solution; although my instructor said there is.
2w+x+y+2z=-2
3w+2x+y-z=9
w+x+y+z=0
w+2x+2y-z=10

Thanks!
Click here to see answer by AnlytcPhil(1806)

Question 445436: What do you do when an equation does not balance?
Click here to see answer by MathLover1(20850)

Question 445496: it's says: solve by substitution. x-3y=-8 and y=x+2. I alreay know the answer, its (1, 3) but everytime i work it i come up with something completely different.
Click here to see answer by rwm(914)

Question 445057: Factor completely.
125a^3 � 27b^3
A) (125a - 3b)(a2 + 15ab + 9b2)
B) (5a + 3b2)(25a2 � 15ab + 9b2)
C) (5a - 3b)(25a2 + 9b2)
D) (5a - 3b)(25a2 + 15ab + 9b2)
E) none of the above
I think its C, but I know it can be factored more because 25 can be 5 and 9 can be 3. I just want to make sure its either C or E.
thanks
PAola

Click here to see answer by rwm(914)

Question 444767: EXPLAIN HOW TO WRITE (2x+1) (3x+5) AS A POLYNOMIAL. HOW DO THE COEFFICIENTS GET FORMED?

Click here to see answer by rwm(914)

Question 445505: Ten rooms are rented at rates of $80 and $120 per night. The total collected for the 10 rooms is $920. Write a system of linear equations whose solution give the number of each type of room rented. Having problems are how to set of the equations in order to solve. i tried my self and came up with a + b = 10 and 80a + 120b = 920
Click here to see answer by rwm(914)

Question 445628: what is 3x^2+2x-1=0?
Click here to see answer by richard1234(7193)

Question 445691: what is the slope, if it exists, of the line containing the pair of points (3,6) and (4,-9)
Click here to see answer by rfer(16322)

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