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how do i solve multi step equations

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4 Answers

y = 2x-1 ......(1)
Solving for y from 3x-y = -1 leads to,
y = 3x+1 ......(2)
Substituting (1) into (2)
2x-1 = 3x+1
So,
x = -2, y = 2x-1 = -2*2-1 = -5
 
Answer: (-2, -5)

Comments

Comment

I assume you are asking for the solution of the system. Then, the solution is the (x, y) pair that is a solution to BOTH equations. Hence, the y value is the same at that point. Let's solve each equation for y:
 
y = 2x - 1 and y = 3x + 1
 
Since the y values are the same in each case, by substitution
 
2x - 1 = 3x + 1
 
Then, subtracting 2x and 1 from each side, we have
 
-2 = x.
 
Substituting this value of x, we get y = 2(-2) - 1 and y = 3(-2) + 1. This yields y = -5 in each case.
 
Let's check.
 
2(-2) - 1 = -4 - 1 = -5 and 3(-2) + 1 = -6 + 1 = -5
Hey Stephanie -- here's another angle ... 1= 2x-y and -1= 3x-y ==> having another x drops us 2: x= -2 ... thus y= 2(-2) -1 = -5 ... (-2,-5) intersection ... Regards, ma'am :)
Since one equation is already solved for "y", we can use substitution method.

y = 2x − 1
3x − y = − 1

In second equation let's replace "y" by "2x - 1"

3x - (2x - 1) = - 1

3x - 2x + 1 = - 1

 x + 1 = - 1
     - 1    - 1

x = - 2

Now, in first equation, let's replace "x" by "- 2"

y = 2*(- 2) - 1

y = - 5

The answer is the pair of numbers (-2, -5)

Let's verify the answer:

1. -5 = 2*(-2) - 1
    -5 = -5

2.  3*(-2) - (-5) = - 1
       -6 + 5 = -1
       -1 = -1