Question

What values of x and y satisfy x − 3y = 4 and 2x + y = 7 simultaneously?
ANSWERS

x=17 and x=257

x=257 and y=−17

x=7 and y=1

x=3 and y=1

Answer 1

You could actually solve the given system of linear equations, if that's possible, OR
you could substitute the given x- and y-values in each of the given possible answers and determine whether any of these sets 'satisfy" both of the given set of equations.