A ( To check a system of equations by substitution, you plug your values for x and y into the original equations. If both simplified expressions are true then your answer is correct.
For example: To check if
(
2
,
−
3
)
was the correct solution for the system of equation:
y
=
−
x
−
5
,
substitute 2 for x and -3 for y into each equation
They intersect and the lines are the same as parallel. They share the same line as going x to y.
sorry if its a little bit scrambled (i did this last year)
