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

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Question 218744: Please help me solve this problem. 5y-8=3y+12, 5y-8+8=3y+12-8
8y=4
y=0.5
Click here to see answer by stanbon(75887)

Question 219018: How do you solve for y?
Questions such as:
-4x+2y=8
2y+0.5x=16
12-3y=30x
1/2x-3/4y=-2
Click here to see answer by rfer(16322)

Question 219590: from this equation 5=7x+2 how do you determine if the answer will be odd or even without solving the problem?
Click here to see answer by RAY100(1637)

Question 219652: 3x^2*4x^3*5y
Click here to see answer by checkley77(12844)

Question 220150: solve trhe following system of equations using substitution.
2x + 3y = -1
5x - 2y = -12
(__,__)

Click here to see answer by checkley77(12844)

Question 220150: solve trhe following system of equations using substitution.
2x + 3y = -1
5x - 2y = -12
(__,__)

Click here to see answer by jsmallt9(3758)

Question 220147: use the substitution method to solve the following system of linear equations.
-3x - y = 3
-3x - 5y = -21
what is the solution?
(__,__)
Click here to see answer by checkley77(12844)

Question 220269: 1.)what is the solution to the given system of equation?
y=4x+12
3x+2y+46

2.)The lines of sight to a forest fire as follow.
from ranger station A: y=3x-11
from ranger station B: 2x+3y=0
what are the coordinates of the fire, if the fire is where the lines of sight cross?
Click here to see answer by stanbon(75887)

Question 220282: How do you do problems like 2x-3y=-14 ans 3x+4y=-4 using elimination?
Click here to see answer by solver91311(24713)

Question 220282: How do you do problems like 2x-3y=-14 ans 3x+4y=-4 using elimination?
Click here to see answer by stanbon(75887)

Question 220283: solve by substitution 2x-y=4
2x-y=3
Click here to see answer by Alan3354(69443)

Question 220319: solve 3x+7y=-5 x=5-9y using the substitution method
Click here to see answer by jojo14344(1513)

Question 220379: Please help me solve this problem:
0.25x+.05(8-x)=.10(-28)
Click here to see answer by checkley77(12844)

Question 220396: solve each system of equations by using substitution
2x+y=4
3x+2y=1
my work so far was 3x+2(2x+4)=1 and then 3x+4x+8=1 and then you add the x's so 7x+8=1
Now what?

Click here to see answer by scott8148(6628)

Question 220413: Please help me solve this problem.
.25x+.5(4-x)=.10(10)
Click here to see answer by checkley77(12844)

Question 220672: Use the distributive property to remove the parentheses from the following expression 9(t-8)
Click here to see answer by babydoll77stl(4)

Question 220690: solve X square = 20
Click here to see answer by tutor_paul(519)

Question 220971: I have a jar containing 80 coins
either nickels or quarters
total value is $14.60
How many of each coin do I have
Click here to see answer by drj(1380)

Question 221064: . Given the following system of equations
x + y = 4k
2x = k
where k is a constant real number, what method would you use to solve this system and
why? Solve the system for (x, y)in terms of k . List your solution as an ordered pair.

Click here to see answer by stanbon(75887)

Question 221186: How Do I solve This?
Use the substitution method to solve the linear system given. Express
the answer as an ordered pair of the form (x,y)
x + y = 5
2x + y = 6

Click here to see answer by drj(1380)

Question 221187: Use the substitution method to solve the linear system given. Express
the answer as an ordered pair of the form (x,y)
y = x + 2
3x + 2y = 9

Click here to see answer by drj(1380)

Question 221304: adam is 5 years younger than eve. in 1 year , eve will be three times as old as adam wsa 4 years ago. find their ages now

Click here to see answer by drj(1380)

Question 221310: Solve the following system of equations using the substitution method y=x+5,
y=-9x+5
Click here to see answer by drj(1380)

Question 221310: Solve the following system of equations using the substitution method y=x+5,
y=-9x+5
Click here to see answer by sofiyac(983)

Question 221527: Can someone explain to me how to maximize by the simplex method? I get confused after the second step.
Here is the problem,
Maximize P=0.3x ++ 0.4y
Subject to: 4x + 8y equals or less than 1600
12x+8y equal or less than 1920
x equal to or greater than 0; y equal to or greater than 0
Please help me. I know how to do the first step of charting but the second step on confuses me? How do I decide which negative should be the pivot point?
Click here to see answer by stanbon(75887)

Question 221568: 4x+2y=-6
2x+3y=-3
Click here to see answer by drj(1380)

Question 221568: 4x+2y=-6
2x+3y=-3
Click here to see answer by jim_thompson5910(35256)

Question 221989: Solve by the elimination method. 7r-5s=-12 5r-7s=76
What is the solution of the system?
Click here to see answer by jim_thompson5910(35256)

Question 222055: Line L has a slope of 3 and goes through (0,1/8). Find the equation of line L and write it in standard from with integrall coefficients.
Click here to see answer by solver91311(24713)

Question 222121: Find the slope of the line that passes through the points (-9, -9) and (4, -1)
Click here to see answer by checkley77(12844)

Question 222122: Find the x-intercept and y-intercept of the graph of the following equation.
-3x + y = 12

Click here to see answer by rfer(16322)

Question 222157:
I am lost please help
Solve the following equation set by substitution showing work:
3x – y = 5
-6x + 2y = 1

Click here to see answer by scott8148(6628)

Question 222143: Solve the following equation set by substitution showing work:
3x – y = 5
-6x + 2y = 1

Click here to see answer by scott8148(6628)

Question 222199: -2 x - 2 y =5
8 x+ 8 y=-20
Having a hard time with these. thanks for all help!
Click here to see answer by stanbon(75887)

Question 222215: 1/2x+ (-1/2)y=1/2
(-1/3)x+(-3/4)y=2
I divided everything by 1/2 and you get x-y=1 for the first equation.
the second equation i times everything by 12 and get (-4)x + (-9)y = 24
multiply the first equation by -9, so we get -9x +9y = -9.
(-9)x + (9)y = -9
(-4)x + (-9)y = 24
I get (-15/13, -28/13)
But it is wrong, what did i do wrong? Thanks for the help!
Click here to see answer by stanbon(75887)

Question 222162: Find the slope and y-intercept for the line given below showing all wotk:
-4x + 2y = 10

Click here to see answer by rfer(16322)

Question 222162: Find the slope and y-intercept for the line given below showing all wotk:
-4x + 2y = 10

Click here to see answer by MathTherapy(10552)

Question 222186: Solve the system by the addition method showing all work:
(1/6)x + (1/4)y = -2
x � y = -6

Click here to see answer by ankor@dixie-net.com(22740)

Question 222456: 3x-2y=10
x-y=-4
What is the intersecting coordinates?
Here is what I figured:
3x-2y=10
-3x -3x
-2y/-2=-3x/-2 +10/-2
y= 3/2x-5
x-y=-4
-x -x
-y/y= x + 4
Coordinate is (2,-2)
My teacher marked this wrong
Click here to see answer by jim_thompson5910(35256)

Question 222579: the two congruent angles of an isoseles triangle measure (2x-20)degrees each. The third angle measures x degrees. What is the measure of each angle?
Click here to see answer by rfer(16322)

Question 222592: 5.7m+2.25=19.35
Click here to see answer by drj(1380)

Question 222598: Write the equation in the slope-intercept form and then find the slope m and y-intercept b of the corresponding line.
-8x + 6y - 5 = -7
Click here to see answer by Alan3354(69443)

Question 222598: Write the equation in the slope-intercept form and then find the slope m and y-intercept b of the corresponding line.
-8x + 6y - 5 = -7
Click here to see answer by drj(1380)

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