Question

3x-y=5
7x-2y=13
what is the solution?

Answer 1

We guide you to out answers here at OpenStudy. We guide you to the solution.

What do you think the first step is?

Answer 2

do i multiply 3x5?

Answer 3

It depends. Is this a system of equations or two separate equations?

Answer 4

system of equations

Answer 5

3x-y=5
7x-2y=13

Start off by solving the first equation for y. Can you do that?

Answer 6

iam not very good at math, iam good at the basics like multiply,divide,adding,subtracting

Answer 7

Alright. So solve an equation you want to do the oppsite.

3x - y = 5
So, we subtract 3x
-y = -3x + 5

Now, y cannot be negative so we divide
y = 3x - 5

Got it?

Now, we know y = 3x - 5, so plug that into the equation below it.

7x-2(3x - 5) =13 <-- now solve for x.

Answer 8

http://www.mathway.com/ solves equations for you.

Answer 9

1. chose any of the two equations that your are comfortable with in finding "x"
2. in this situation, i chose 3x-y=5
3x - y = 5
3x = 5 +y (transpose y to the other side)
x = 5/3 + y/3 (divide both sides by 3)
3. now, substitute the value of "x" to the second equation
7x - 2y = 13
7(5/3 + y/3) - 2y = 13
4. multiply the one inside in the parenthesis by 7:
35/3 + 7y/3 - 2y = 13
7y/3 - 2y = 13 - 35/3 (transpose 35/3 to the other side)
5. since the common denominator is 3, multiply both sides by 3
now it will become; 7y -6y = 39 -35
y = 4
6. substitute to either of the two equations:
i chose 3x - y = 5
3x - (4) = 5 (substitute "y" to "4")
3x = 5 +4 (transpose 4 to the other side)
3x = 9
x = 3 (divide both sides by 3)
the answer is x=3 and y=4

how to know if your solution is correct?

substitute either of the two equations the values of "x" and "y"
i chose 7x - 2y = 13
7(3) - 2(4) = 13
21 - 8 = 13
13 = 13
therefore, the solution is correct....