Question

The set of solutions of systems of equations x + 3y = -1 then 2x-y = 5 is

Answer 1

Hey there!

The first equation multiplies 2:
2x + 6y = - 2
2x - y = 5
_________ _
7y = - 7
  y = - 1
  x = 2

Hope it helps you!

Answer 2

The two equations are --

x + 3y = -1
2x - y = 5

To make 'x' equal multiply 2 to first equation.

2x + 6y = -2 ---(1)
2x - y = 5----(2)

Equating (1) and (2),
7y = -7
y = -1

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

So required solution (2,-1)

Hope This Helps You!