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Tutors Answer Your Questions about Systems-of-equations (FREE)
Question 98445This question is from textbook elementary and intermediate algebra
: the sum ot three numbers is 105. the third is 11 less than ten times the second. twice the first is 7 more than three times the second. find the numbers.
my work so far:
a+b+c=105
10b=c+11 >> 10b-c=1
2a=7+3b >> 2a-3b=7
next i know i have to get rid of one of the numbers so i decided on "a" and i started with equations 1 and 3 so i multiplyed 1 by 2 so the "a"s would cancel out.
-2a-2b-c=105
+
2a-3b=7
-5b-c=112
but now im stuck i dont know what to do next.
This question is from textbook elementary and intermediate algebra
Click here to see answer by mathslover(126)   |
Question 99508: A youth group with 26 members is going skiing. Each of the 5 chaperones will drive a van or sedan. The vans can seat seven people, and the sedans can seat five people. How many of each type of vehicle could transport all 31 people to the ski area in one trip?
Click here to see answer by cristianalfredo(1) |
Question 100179: I can't understand
Which strategies could be used for solving the following system of equations?
2x + y = 4
x - y = 2
a. Graph both equations on the coordinate plane and find the point of intersection.
b. Solve the first equation for y and then substitute that expression into the second equation.
c. Add the two equations together resulting in an equation with one variable.
d. a, b, and c are all correct
Click here to see answer by josmiceli(3008) |
Question 100179: I can't understand
Which strategies could be used for solving the following system of equations?
2x + y = 4
x - y = 2
a. Graph both equations on the coordinate plane and find the point of intersection.
b. Solve the first equation for y and then substitute that expression into the second equation.
c. Add the two equations together resulting in an equation with one variable.
d. a, b, and c are all correct
Click here to see answer by Earlsdon(4900) |
Question 100180: How can I do this?
In the following system of linear equations, state how to combine the two equations to obtain one equation with only one variable.
5x - 4y = 6
2x + 3y = 2
a. Multiply the terms in the first equation by 3, the terms of the second equation by 4, and then add the equation.
b. Multiply the terms in the first equation by 2, the terms of the second equation by 5, and then add the equations.
c. Multiply the terms in the first equation by -3, the terms of the second equation by 4, and then add the equations.
d. Add the equations
Click here to see answer by oberobic(93) |
Question 100303: Please help me solve this equation - It is in fractions- I keep getting lost in my work
5+ x/3 = 2x/5 -7
X=
at one point I had it set up and worked as
75 + 15x/5 = 30x/15 - 105
75x = 2X -105 If I am on the right path I am lost on what to do next- If I am completely wrong then I need help from the beginning. Please advise
Click here to see answer by stanbon(26274) |
Question 100330: The following is the equation I am having difficulty with. I submitted it once before but made a mistake writing it.
5+ x/3 = 2x/5 -7 (these are fractions)
X=
at one point I had it set up and worked as
75 + 15x/5 = 30x/15 - 105
75x = 2X -105
If I am on the right path I am lost on what to do next- If I am completely wrong then I need help from the beginning. Please help me solve this equation -It is in fractions- I keep getting lost in my work
Click here to see answer by checkley71(8405) |
Question 102646: I am trying to help my college daughter with some problems.
She says they are order of operations questions. I don't know all the symbols on the keyboard.
Here are the problems:
-36 divided by (-2)x (3) + the square root of 169-25 +12
The back of her book says the answer is 78 and we sure aren't getting that.
2/5 divided by (-1/10) x(-3) + the square root of 64+36
Answer 22
-16x3/4 divided by(-2)+ the absolute value of 9-3(4+1)
Answer 12
4[5-8(2+1] divided by 3-6-(-4)to the second power
Answer 4
I am trying to help her over the phone and she is worried about an exam so I would appreciate any help.
Thanks so much! Robin
Thanks!!! Robin
Click here to see answer by stanbon(26274) |
Question 104244: 1. 2x-y=1
6x-3y=3
2. y=5x-1
y=5x+4
3. x+y=38
x=2y-25
4. -2x+5y=9
x+y=13
5. 2x+y=7
3x-y=3
6. y=3x+2
2x+y=-8
7.y=-x-3
y=-2x-8
8. y<_3x-2
y>x+1
9. y=x
y=2x-4
10. -2x+y=6
y=3x+9
11. y<3x-2
-3x+y-2
12. x+y=8
x-y=10
13. y=x-3
y=-3x+25
14. 4x=2y+1
2x+y=4
15. x=2y=10
2x+4y=10
16. y=x+4
y=4x+1
17. y=6x-4
y=-2+28
18. 3x-1oy=-25
4x=40y=20
19. 8x=11y=20
5x-11y=59
20.x-4y=11
8x-6y-36
Click here to see answer by MathLover1(1183)  |
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