Question

All you need is in the photo ​

Answer 1

X + Y = 1 ------1

X - 2y = 4 ------2

Solving by substitution method

X = 4 + 2y -----3

Putting the value of X in equation 1

4 + 2y + y = 1

4 + 3y = 1

3y = 1 - 4

3y = (-3)

y = (-3) /3

y = (-1)

Putting value of y in equation 3

X = 4 + 2(-1)

X = 4 - 2

X = 2