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

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Question 19106: Please help me solve this equation.
1/2 x + 1/3 x = 7

This is what I had tried, but I can't figure out what to do halfway through.
I multiplied everything by 6; the common denominator.
6(1/2)x + 6(1/3)x = (7)6
And then I got:
3x + 2x = 42
I subtracted 2x from 2x and then subtracted it from 42.
3x + 2x = 42 - 2x
- 2x
This is where I get stuck.
3x = 40x

Click here to see answer by MelanieBCC(40)

Question 19158: how do I do:
x=-3y+10
-x+y=-10
using the substitution method
Click here to see answer by wuwei96815(245)

Question 19174: solve by addition
x - y = -3
x - y = 4
Click here to see answer by wuwei96815(245)

Question 19192: I have a problem that has (1,5) and (2,7) i have to figure out what the equation is for the slope-intercept form.
Click here to see answer by jakegfan(4)

Question 19192: I have a problem that has (1,5) and (2,7) i have to figure out what the equation is for the slope-intercept form.
Click here to see answer by Earlsdon(6294)

Question 19228: How do you solve:
5x+3y-2z=112
7x+5y=70
3x+y=9z+96
and
3w+3x+6y+5z=10
4w+5x+8y+2z=15
3w+6x+7y+4z=30
4w+x+6y+3z=25
Click here to see answer by longjonsilver(2297)

Question 19318: I need to find the slope-intercept form of (0,1) (3,-8). How do i figure out how to find the equation?
Click here to see answer by Earlsdon(6294)

Question 19222: x + x + x = x
Click here to see answer by Alwayscheerful(414)

Question 19369: 5x-8x=18
Click here to see answer by piglet162431(90)

Question 19430: HELP....
My daughter need to find the LCM for this problem.
25;100;64
Thanks a lot.

Click here to see answer by Earlsdon(6294)

Question 19496: how do u do writing linear equations given two points
Click here to see answer by xcentaur(357)

Question 19970: elimination method
3x+2y=-24; 4x+3y=18
5x-4y=-114; 2x+6y=-57
Click here to see answer by glabow(165)

Question 20033: i missed a day of algebra today and i missed the lesson on linear equations could you please explain the lesson in english?!
thank you,
absentee
Click here to see answer by elima(1433)

Question 20057: Hi i am studying for an algebra placement exam on Monday. I used the linear system solver for
3x+4y = 27
-3x+4y = -27
I get the substitution as far as x a function of y from the first equation
x = (27 - 4y)/3
But why does the -4y become +4y when you substitute it into the second equation?
-3(27+4y)/3+4y=-27
Also what are the steps in simplifying that takes you from -3(27+4y)/3+4y=-27
to: 24y=0
or y=0
Trying to comprehend!
Click here to see answer by wuwei96815(245)

Question 20264: 7y=2y-15,9x=2x+14,99+6u=-3u
Click here to see answer by rahman(247)

Question 20303: I have tried this problem four times---My book says the answer should be -13/2
I keep getting different answers----What is the step by step procedure?
PROBLEM: 2/5x-5=12/5x+8
Click here to see answer by suresh(20)

Question 20398: Does the point (-5, 2) satisfy the following compound inequality and how? Can someone help me with?
3x � 5y < 15 and 3x + 2y < 12
Thank you in advance.
Click here to see answer by Earlsdon(6294)

Question 20480: Here is another one,
solve each system by the addition method.
2x=2-y
3x+y=-1
Help,I have no clue.
Click here to see answer by suresh(20)

Question 20479: How do I solve this?
3x+4y=-5
5x+6y=-7
Click here to see answer by suresh(20)

Question 20400: Write down the equation for the line that passes through the point (3, -2) and is perpendicular to the line y = 2x + 4.
How do I do this?

Click here to see answer by suresh(20)

Question 20476: How do I solve this
It says solve by the substitution.
3y-x=0
x-4y=-2
my answer is 0 is this right? please help me.
Click here to see answer by suresh(20)

Question 20532: Hello,
I have a list of equations below theres suppose to be two sets of parallel lines which one are ? also there are suppose to be 3 pairs of perpindicular lines as well i'm suppose to identify the perpindicular equations by letters and equations and for the parallel i'm suppose to criss cross by connecting each parallel line: heres the list::
correct me if i'm wrong
x = 3
y = 2x-1
y/2 = x+3
y = -7

2y = -x
x = -2

I know -2 and -7 are horizontial x=3 i think is perpindicular and 2x-1 is parallel so how can answer this problem logically to supply the answers that are needed thanks for looking and trying to help!

Click here to see answer by mmm4444bot(95)

Question 20720: Trying to solve this equation. Have four choices on worksheet but cant get the right answer. the problem is (7x-7)squared=36. The choices are 13/7,0
29/7 -13/7,-1/7 13/7,1/7 thanks

the next problem is 2n squared = -8n-1 thank you again
Click here to see answer by kapilsinghi(68)

Question 20696: How do i graph 3x + 2y >/= 6?
by >/= that i mean larger or equal to.
The help would be enormously appreciated!
Click here to see answer by kapilsinghi(68)

Question 20817: Please help me how do you solve this problem?
1/2a+4b=11
a-5b=-4
I have to do this problem by using elimination
Click here to see answer by kapilsinghi(68)

Question 20849: How do you solve:
3x + y = 8
y= x + 4
Click here to see answer by kapilsinghi(68)

Question 20844: please help me solve this equation

Click here to see answer by kapilsinghi(68)

Question 20844: please help me solve this equation

Click here to see answer by djrkad(1)

Question 20949: Renting A Moving Van
A rentle company charges a flat fee of $30 and an addional $.25per mile to rent a moving van.
write an equation to the model the total charge y(in dollars) in terms of x, the number of miles driven.
Miles(x) 25 50 75 100
Cost(Y) ? ? ? ?

Click here to see answer by CertifiedGenius(6)

Question 21172: I need to solve using substitution:
2x+5y =25
3x-2y+4z=1
4x-3y+ z=9

Please help I am so confused!
Thanks,
Cecilia
Click here to see answer by venugopalramana(3286)

Question 21341: my homework asks me to graph this equation

x=3 i have no idea how im going to graph this without a
y-coordinance.
Click here to see answer by kalants(7)

Question 21359: Write the equation of the circle through the points (-1,0), (2,1), (0,3).
Click here to see answer by venugopalramana(3286)

Question 21358: ln(x-3)+ln(x)=ln(4)
Click here to see answer by venugopalramana(3286)

Question 21357: Solve |3x-7|>=2
Click here to see answer by venugopalramana(3286)

Question 21325: Determine whether the line through P1 (1,-2_and P2 (4, -3) IS PARALLEL TO THE LINE THROUGH q1 (4,3) AND q2 (7,4) GRAPH IT
Click here to see answer by Photonjohn(42)

Question 21396: I am crashing and burning in my college algebra class...
Write the equation of a line that passes (2,-5) and (3,-10). Write the answer in slope-intercept form.
I have determined that the slope is -15 and I know the slope-intercept formula is y = mx + b....
what do I do next???
Click here to see answer by queenofit(120)

Question 21705: When it says solve using the substitution method, how do you solve the equation when there are no numbers to substitute in?
Example:

x = y + 6
y = -2 - x
How do i solve using the substitution method?

Click here to see answer by longjonsilver(2297)

Question 21742: You need to buy 8 packages of meat. A package of hotdogs costs $1.89 and package
of hamburgers costs $5.19. You spend a total of $31.62.
a) Let x represent the number of packages of hotdogs bought and let y represent
the number of packages of hamburgers bought. Write a system of equations you
could solve to find the number of packages of each type of meat bought.
b) solve the system
Click here to see answer by Paul(988)

Question 21858: -7x=8x-3
Click here to see answer by Anglophile(11)

Question 21861: 5x+4y=100

Click here to see answer by bendandapril(1)

Question 21550: I can't remeber how to solve for x in a case such as this: (I've looked everywhere)
1/sqrt(30-x)= 4
Thanks.
Click here to see answer by pwac(253)

Question 21988: 1. 18-3y=5

2. -14+9a=38

3. 14r+8=32

4. 37-58b=204
Click here to see answer by Earlsdon(6294)

Question 21988: 1. 18-3y=5

2. -14+9a=38

3. 14r+8=32

4. 37-58b=204
Click here to see answer by Alwayscheerful(414)

Question 22238: 5e+4f=9
4e+5f=9
how do u solve this in linear equation form,in substitution, and graphing
Click here to see answer by MORUPHOSUOLALE(24)

Question 22239: the sum of two numbers is 14. Six times the first number minus three times the second number is 3. Find the numbers.
Click here to see answer by Paul(988)

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