Question

Solve the following system using the substitution method:
6x - 2y = -4
y = 3x + 2

Answer 1

sub the 2nd into the 1st:

6x - 2(3x+2) = -4
6x - 6x - 4 = -4
-4 = -4

infinite number of solutions, just use the 2nd, pick any x you feel like, and get the y
e.g.
x = 2
y = 3(2)+2 = 8
etc

What you really have is the same equation twice.
(multiply the 2nd by 2 and you will get the 1st)

Answer 2

Which of the following solution of the given system of linear equations?
{x-2y=-16
{6x+2y=-26