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Tutors Answer Your Questions about Linear-systems (FREE)
Question 85531: 2x+y=2
4x+y=4
If you multiply one of these by -1, the Ys will cancel, enabling you to solve it for x:
-1(2x + y = 2) --> -2x - y = -2
4x + y = 4 --> 4x + y = 4
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2x = 2
x = 1
Now plug 1 in for x into either of the original equations to get y:
2(1) + y = 2 [using the first eqution]
2 + y = 2
y = 0
The solutoin is (1 , 0)
Click here to see answer by scianci(186)   |
Question 85528: two trees and ash and an oak, grew together side by side in the forest. Over the years the ash grew to be one and a quarter times as high as the oak. One day the woodcutter came along and lopped 3 meters off the height of both trees and now the ash is one and a third times the height of the oak. How high was the ash originally
Click here to see answer by stanbon(26278) |
Question 86906: Yuk! I hate applications. I always get mixed up picking picking what goes where in the equations. I had one person show me how to solve it using just equations, another showed me how by using a table. I'm confused with both of them.
Here it is.
A truck rental agency charges a daily fee plus a milage fee. Mel was charged $85 for 2 days plus 100 miles, and Sarah was charged $165 for 3 days and 400 miles. What is the agency's daily fee and their milage fee?
a) Write the system of equations for this problem.
b) Find the solution.
Click here to see answer by Nate(3495) |
Question 87444: 51) You now have had practice solving equations with one variable and equations with two variables. Compare equations with one variable to equations with two variables. How are they alike? How are they different?
Click here to see answer by rapaljer(3620) |
Question 87578This question is from textbook Beginning Algebra
: Good Evening Tutor,
I have a question from a question in the textbook. The area of a triangle is
A=1/2bh.
My question asks: Solve each literal equation for the indicated variable.
I am solving (for b) the area of a trapezoid and the equation is
A=1/2h (B+b)
I am unsure how to change the equation to find b can you please explain to me what equation to use and why? I am sure that B+b will be the lengths of the 2 parallel sides but I am unsure how to get to the answer. Thank you greatly for your help. This question is from textbook Beginning Algebra
Click here to see answer by rapaljer(3620) |
Question 88168: Please help me solve this. I have the answer, but I'm stuck on how to work the problem to make my answer match the one that was given to me. I was told to use it as a guide to compare my work to the answer that was given to me and I'm really stuck. The problem is:
1/3x+2/1y=3/1
2/3x-3/5y=2/5
Click here to see answer by stanbon(26278) |
Question 88314: I dont understand the following: solve by graphing
x+y=7
2x-y=5
The instructions also say if you solve the system and the variables both add out, you need to tell whether the system consists of lines that coincide (infinite solutions) or parallel lines(no solution)
Click here to see answer by rapaljer(3620) |
Question 88547: The graph of y = 2x + 7 is:
A.The same as the graph of y = 2x moved to the right 7 on the x axis
B.The same as the graph of y = 2x moved to the left 7 on the x axis
C.The same as the graph of y = 2x moved up 7 on the y axis.
D.The same as the graph of y = 2x moved down 7 on the y axis.
Click here to see answer by checkley75(3666) |
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