Question

{x-y=3} {x+2y=9} EQ linear?

Answer 1

x - y = 3(2)
x + 2y = 9

2x - 2y = 6
x + 2y = 9
  3x = 15 ==> x = 5

x - y = 3 ==> y = x - 3 ==> y = 5 - 3 ==> y = 2