Question

Solve the system y=2x-1

Answer 1

Lets solve our system of equations step by step:
$y=2x-1$ equation (1)
$3x-y=-1$ equation (2)

Step 1. Replace equation (1) in equation (2)
$3x-y=-1$
$3x-(2x-1)=-1$
$3x-2x+1=-1$
$x=-2$ equation (3)

Step 2. Replace equation (3) in equation (1)
$y=2x-1$ 
$y=2(-2)-1$
$y=-4-1$
$y=-5$

We can conclude that the correct answer is: A (−2, −5)