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

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Question 117380: A photo shop has a self service photo center that allows you to make prints of pictures. Each sheet of printed pictures costs $8. One sheet has four 3x5 pictures and the other sheet has two 4x6 pictures. You want at least 16 pictures of any size and you are willing to spend up to $48. Write a system of inequalities that models the situation. Please help! Thanks.
Click here to see answer by kamallohia(18)

Question 117271: The cost per mont of making n number of wooden toys is C=3n+30. The income from selling n toys much the cpmpany make to get a profit (I greater than C).
Click here to see answer by checkley71(8403)

Question 118186: Graph the line -4x+5y=20
I forgot how to do this, could you help :)
Click here to see answer by sajankumar(7)

Question 118233: Mr. Santos traveled for 2 hours at a constant speed. Because of patholes, he reduce his speed by 7 km per hour for the next 2 hours. if he traveled 206 km, what was his speed on the first part of the trip?
Click here to see answer by josmiceli(19441)

Question 118241: x+3y=2
-x+y=1
Click here to see answer by jim_thompson5910(35256)

Question 118240: 2x-y=4
2x-y=3
Click here to see answer by jim_thompson5910(35256)

Question 118239: Solve each system by graphing

x=y+3
3x-2y=4
Click here to see answer by tutorcecilia(2152)

Question 118238: Solve each system by graphing
y=-2/3x
2x+3y=5

Click here to see answer by stanbon(75887)

Question 118262: (writing linear equations in point slope form)
write the point-slope form of an wquation of the line that passes through each pair of points.
(-1,-7),(1,3)
Click here to see answer by jim_thompson5910(35256)

Question 118261: (graphing linear equations)
Graph each wquation by using the x-and y-intercepts.
3x-y=3
Click here to see answer by jim_thompson5910(35256)

Question 118259: (writing linear equations in slope-intercept form)
Find the x and y intercepts of the graph of each equation.
4x-3y = 12
Click here to see answer by jim_thompson5910(35256)

Question 118341: White each equation in slope-intercept form.
#9 3.4
3x - 4y = 80
#21 3.4
find the equation of the line that goes through the given point and has the given slope. Write the answer in slope-intercept form.
(-1, -7), -6

Click here to see answer by bucky(2189)

Question 118419: Hello,
The answer has been provided, I am having dificulties showing how to arrive at the answers given. Can you please show how the problems are broken down for the desinated answers. Thank you

pg. 451
54) x+3y=2
-x+y=1
answer: (-1/4,3/4)

pg. 460
34)
3/7x + 5/9y =27
1/9x +2/7y =7
answer: (63,0)

pg. 461
50)
2y-x=3
x=3y-5
answer: (1,2)

pg. 510 Ch.8
18) -3x>0 and 3x-4 < 11

pg. 510 Ch.8
32) x > 3 or x < -3 ___-5____-4__-3__-2
__-1___0___1___2___3____4____5

)----------------------------------------(

pg 510 Ch. 8
50) -1 (< greater than or equal to) 3-2x<11
___-5____-4__-3__-2 __-1___0___1___2___3____4____5

(----------------------------------------]
30) 3 -1/2 absolute value l 1/2x - 4 l=2

62) 1/3 absolute value 2x-4 l < 1
___-5____-4__-3__-2 __-1___0___1___2___3____4____5

(--------------------)
pg. 521 Ch. 8
word problem
86) In July 1985 steve Cram of Great Britain ser a world record of 3
minutes 29.67 seconds for the 1500-meter race and a world record of 3
minute 46.31 seconds for the 1-miles race ( The Doubleday Almanac).
Suppose you know only that these teo events occurred 11 days apart and
that the 1500-meter record was set on July 16. Use an absolute value
equation to find the possible dates for the 1-miles record run.

pg. 529 Ch. 8
18) X > equal to or greater than -2 and x - 3y < 6

Click here to see answer by stanbon(75887)

Question 118448: I AM WORKING ON THE aMERICAN SCHOOL CIRICULUM AND I AM DOING A HOME TEST. I HAVE THE FOLLOWING WORD PROBLEM AND I CAN'T UNDERSTAND HOW TO GET THE TWO ANSWERS ASKED FOR.
A SAILBOAT TRAVELS 20 MILES DOWNSTREAM IN 3 HOURS.IT RETURNS IN 4 HOURS.FIND THE SPEED OF THE SAILBOAT IN STILL WATERAND THE RATE OF THE CURRENT.
I CAN FIGURE OUT THAT THE RATE OF THE BOAT GOING DOWN STREAM WOULD TRAVEL 6.23 MPH AND COMMING BACK IT WOULD TRAVEL 5 MPH. I CAN'T FIGURE OUT HOW THAT WILL HELP ME.
Click here to see answer by solver91311(24713)

Question 118439: pls help me...
Given the points P(-1,-2) Q(4,2) and R(1,m) in the coordinate plane. Find the value of m so that PR + RQ is minimum...thanks
Click here to see answer by solver91311(24713)

Question 118641: Can you assist me with the following problem
0.08x+0.5(x+100)=73.2
0.08x+0.5x+0.50=73.2
x=40

Thank you for your help
Click here to see answer by jim_thompson5910(35256)

Question 118641: Can you assist me with the following problem
0.08x+0.5(x+100)=73.2
0.08x+0.5x+0.50=73.2
x=40

Thank you for your help
Click here to see answer by Nellene Mae(3)

Question 118644: please help
raising rabbits. Before Roland sold two female rabbits half of his rabbits were female. If x represents his orginal number of rabbits, then
1/2x -2= 1/3(x-2).
Thank you
Click here to see answer by jim_thompson5910(35256)

Question 118686: Change the equation -2x + 8y =4 to slope intercept form.
Here are the steps I have preformed....
8y = 4 + 2y
y = 1/2 + 1/4
Is this right?
Click here to see answer by alexander164(3)

Question 118687: Give the equation y = -7x + 5 name 2 points you could use to graph the line. I'm not sure how to do this, and I'm kinda confused!
There is also another problem, it is Graph the line -4x + 5y = 20 I am not sure how to do this, but I think that the x-intercept is (-5,0) and the y-intercept (0,4)I am I right?
Click here to see answer by stanbon(75887)

Question 118723: Please help with this question--What is the x co-ordinate of the system of equations ? 2x + y = 3 and x - 2y = 4.
Thanking you
Gloria
Click here to see answer by MathLover1(20850)

Question 118723: Please help with this question--What is the x co-ordinate of the system of equations ? 2x + y = 3 and x - 2y = 4.
Thanking you
Gloria
Click here to see answer by m.hansen(16)

Question 118831: Rewrite the equation 4x/3 = 3y/4 +1 in function form by solving for y. Show all work.
Click here to see answer by MathLover1(20850)

Question 118852: Solve the following systems by graphing.
How do I graph the equation? For example:
3x-6y= 9
x-2y= 3
Do I graph the these numbers from the equations 6y and 9, 2y and 3? Or do I work out the equations and graph the numbers from the answer to the equations?
Thank you for your assistance.
Click here to see answer by jim_thompson5910(35256)

Question 119072: Write an equation of a line that contains the given point and is perpendicular to the given line.
2x+4y=-7; points(-3, -2)
Click here to see answer by Fombitz(32388)

Question 119112: 3x-3y+3z=-27
2x+2y+3z=-3
-3x+2y+2z=-3
Click here to see answer by Fombitz(32388)

Question 119180: A light plane flew from its home base to an airport 255 miles away. With a headwind, the trip took 1.7 hours. The return trip with tailwind took 1.5 hours. Fine the average airspeed of the plane and the average wind speed.
Click here to see answer by checkley71(8403)

Question 119179: A light plane flew from its home base to an airport 255 miles away. With a headwind, the trip took 1.7 hours. The return trip with tailwind took 1.5 hours. Fine the average airspeed of the plane and the average wind speed.
Click here to see answer by checkley71(8403)

Question 119273: The value of a "Mint State-63" (unicirclated) 1950 Jefferson nickel minted at Denver is 8/7 the value of a similar condition 1945 nickel minted at Philadelphia. Together, the total value of the two coins is $15.00. What is the value of each coin?
n+8/7n=15
Click here to see answer by tutorcecilia(2152)

Question 119333: I need to graph this equation:
x+6=-5
it's supposed to be standard form like
Ax+By=C
My teacher said to use the numbers -2 -1 0 1 2 3
but they don't work.
Click here to see answer by Fombitz(32388)

Question 119387: Solve each of the following systems by graphing

2x � y = 4 and 2x � y = 6
x-2y =8 and 3x-2y=12

Click here to see answer by checkley71(8403)

Question 119436: solve each system by substitution

y=x+3
y=2x+4
Click here to see answer by HyperBrain(694)

Question 119517: 3/5x-2/5y=5
Click here to see answer by MathLover1(20850)

Question 119639: Please show me how to solve this problem:
2t + 4s = 10
3t + 3d = 9
1t + 3d + 2s = 8
Click here to see answer by stanbon(75887)

Question 119769: solve by substitution
x-y=-3
x-y=4
Click here to see answer by checkley71(8403)

Question 119693: complete ordered pair solutions

3x+4y+12 (0,),(,3\4) ,(,0),(8\3,)
Click here to see answer by checkley71(8403)

Question 119807: Can you show me how to solve this system of equations: y=3x
x+21=-2y
by the substitution method?
Click here to see answer by jim_thompson5910(35256)

Question 119835: How do you solve this system of equations where 4x+3y=-2
5x+7y=17
by using the elimination method?
Click here to see answer by jim_thompson5910(35256)

Question 119835: How do you solve this system of equations where 4x+3y=-2
5x+7y=17
by using the elimination method?
Click here to see answer by kjwade3(1)

Question 119870: I need assistance on the following.
I need to solve by graphing.
Thank You
3x+4y<12
x+3y<6
x>0
y>0

Click here to see answer by jim_thompson5910(35256)

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