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

Tutors Answer Your Questions about Linear-systems (FREE)

Question 912607: How do you solve the system by substitution?
4/3x+5/6y=55
x=2y-6
Click here to see answer by Fombitz(32388)

Question 912923: Maximise P= 4x + 6y subject to the following constraints
2x + y = 180, x +2y =160 and x + 2y = 100

Click here to see answer by Fombitz(32388)

Question 913021: You are part of the rescue team in a ship at sea. One of your divers is 250 feet below sea level, and she injured herself. She has only a 7 minute supply of air in her tank, and can only rise towards the surface at a rate of 10 feet per minute. You are sending down a rescue sub. The sub can descend at a rate of 30 feet per minute. Will the diver still have any oxygen left in her tank when the sub gets to her?
Click here to see answer by josmiceli(19441)

Question 913035: You are part of the rescue team in a ship at sea
Click here to see answer by richwmiller(17219)

Question 913058: You are part of the rescue team in a ship at sea.
Click here to see answer by richwmiller(17219)

Question 913099: Are there a web site I can use such as math way that can help me and show me the step so I can learn to do these problem on my own.
√y-13-4=6
Solve for y, where y is a real number.
Click here to see answer by MathLover1(20850)

Question 913546: help me solve 8x-15(-3x+2)=2
Click here to see answer by jim_thompson5910(35256)

Question 913546: help me solve 8x-15(-3x+2)=2
Click here to see answer by MathLover1(20850)

Question 913540: X-Intercept is 4 and Y-Intercept is -7
Click here to see answer by mananth(16946)

Question 913897: The sum of two numbers is 51. The second number is six less than twice the first number. Find the two numbers.
Click here to see answer by rfer(16322)

Question 913913: You have 15 coins in your pocket. The coins are either quarters or dimes.You have a total of $3.15. How many quarters and dimes do you have?
Click here to see answer by ichigo449(30)

Question 914282: mariko paid 135 for parts and labor on new brakes for her car if the parts cost 85 and the work takes 2.5 hours how much does the mechanic change per hour for labor
Click here to see answer by josmiceli(19441)

Question 914391: I need to solve system of equations by addition method
2x+y=6
4x+2y=12
I am lost. Thank you.

Click here to see answer by MathLover1(20850)

Question 914397: Find the slope of 5y = 4x plus 6.
Click here to see answer by MathLover1(20850)

Question 914419: I need to solve system of equations by addition method
10x+3y=-12
5x=-4y-16
I am lost on this problem also.

Click here to see answer by Alan3354(69443)

Question 914432: 3x-2y=12
y+-2x + 8

Click here to see answer by jim_thompson5910(35256)

Question 914583: 2x-y+2z=7
-x+2y-4z=5
x+4y-6z=-1
Click here to see answer by ewatrrr(24785)

Question 914585: 7x+8y=25
9x+10y=35 using substitution or elimination
Click here to see answer by josgarithmetic(39617)

Question 914585: 7x+8y=25
9x+10y=35 using substitution or elimination
Click here to see answer by MathTherapy(10552)

Question 915033: graph a parabola in Vertex
y=−4x 2 +40x−95.
Click here to see answer by josgarithmetic(39617)

Question 915070: My question is a systems d=rt. I have tried but failed to solve it.
A salmon swims 200m in 12 minutes downstream. Swimming in the opposite direction it takes that fish 15 minutes to travel the same distance. Find the rate of swimming for the fish and the rate of the current. Thanks in advance and hopefully I get the answer (or at least help) fast.
Click here to see answer by josgarithmetic(39617)

Question 915066: Here is my question; i have tried multiple times to solve it and looked at other solutions.
The ones digit of a number is 1 more than twice the tens digit. If the digits are reversed, the new number is less than 3 times the original number. What is the original number? Thank you in advance for your help, and hopefully it comes fast.
Click here to see answer by josgarithmetic(39617)

Question 915093: 3x + 5y = -16
3x - 2y = -9
Click here to see answer by bb101(1)

Question 915113: find the value of x if y=8 in the equation: 2x + 4y = 50
Click here to see answer by jim_thompson5910(35256)

Question 915113: find the value of x if y=8 in the equation: 2x + 4y = 50
Click here to see answer by tonyclarke(17)

Question 915110: 4x-2y=28 if x=8
Click here to see answer by jim_thompson5910(35256)

Question 915110: 4x-2y=28 if x=8
Click here to see answer by tonyclarke(17)

Question 915124: find the value of x if y = 8 in the equation: 2x + 4y = 50
Click here to see answer by jim_thompson5910(35256)

Question 915117: The ones digit of a number is 1 more than twice the tens digit. If the digits are reversed, the new number is 8 less than 3 times the original number. What is the original number? Thanks in advance, and please do hurry up, I need to submit it soon.
Click here to see answer by josmiceli(19441)

Question 915131: what is the ratio of 1/2 to 2/5?
Click here to see answer by jim_thompson5910(35256)

Question 915502: 2x+4y-3z=25
-3x+5y+2z=-81
5x+9y-5z=46
can you please solve this and DO NOT use cramers rule? thanks!
Click here to see answer by richwmiller(17219)

Question 915722: Consider a square and a regular hexagon (a six-sided figure with sides of equal length). One side of the square is 2 feet longer than a side of the hexagon, and the two figures have the same perimeter. What are the lengths of the sides of each figure?
Click here to see answer by josgarithmetic(39617)

Question 915733: I need help trying to make up a real life system of linear equation word problem and how it helps us in daily life!.
Click here to see answer by josgarithmetic(39617)

Question 915964: Determine whether the ordered pairs in the form (x, y) are solutions of the given equation and select the correct answer.
3x - y/4 = 11 (3, -8), (4,4)
A. Yes, both are solutions
B. No, neither is a solution.

C. The first is a solution, but the second is not.

D. The first is not a solution, but the second is.

Click here to see answer by MathLover1(20850)

Question 916020: A pair of shoes and a sweater cost $98. If the sweater cost $16 more than the shoes, how much did the sweater cost?
Click here to see answer by JulietG(1812)

Question 916022: The rectangular field in the following illustration is surrounded by 72 meters of fencing. If the field is partitioned as shown, a total of 88 meters of fencing is required. Find the dimensions of the field.
Here is the illustration: http://imgur.com/HRZwHUl
Click here to see answer by JulietG(1812)

Question 916125: Solve the following system.
x+(1/3y)+z=13
(1/2x)-y+(1/3z)=-2
x+(1/2y)-(1/3z)=2
Click here to see answer by mananth(16946)

Question 916177: s(t) = −16t2 + v0t + s0.
If s(1) = 94 and s(4) = 79, what are v0 and s0?
Click here to see answer by Fombitz(32388)

Question 916504: y=4/3X + 1/2
I need to find the slope and y intercept and graph it. oh my
Click here to see answer by josgarithmetic(39617)

Question 916536: x+1/20y=1/4
3x+2y=2
substitution elimination method
Click here to see answer by ewatrrr(24785)

Question 916573: Use the elimination method to solve the system of equations. Choose the correct ordered pair.
4x - 2y = -2
4x + 5y = 33
Click here to see answer by Alan3354(69443)

Question 916580: y+2=-3/5(x+5)
Click here to see answer by Alan3354(69443)

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