Question

how to solve x+y=0 x-y=2 by substitution method

Answer 1

Answer:

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Answer 2

Answer:

Solve equation [2] for the variable x

[2] x = y + 2

// Plug this in for variable x in equation [1]

[1] (y +2) + y = 0

[1] 2y = -2

// Solve equation [1] for the variable y

[1] 2y = - 2

[1] y = - 1

// By now we know this much :

x = y+2

y = -1

// Use the y value to solve for x

x = (-1)+2 = 1

Solution :

{x,y} = {1,-1}

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