Solve the following system of equations by the substitution method. x - y = 0 x - y - 2 = 0 what is the solution set? {(1, -1)} {(-1, 1)} ∅

∅ no solution

Step-by-step explanation:

Given the two equations:

x - y = 0 and x - y - 2 = 0,  add '2' to both sides of the second equation:

x - y - 2 + 2 = 0 + 2 or x - y = 2

So, this is saying that 'x - y' can be equal to both 0 and 2, which isn't possible.  To check your work, set one equation equal to the other variable, then substitute and solve:

x = 2 + y

2 + y - y = 0

2 ≠ 0

no solution is possible

answer: 1 and 3

step-by-step explanation:

your answer would be 12