Question

y=3-6x x-3y=15 resolucao

Answer 1

y = 3 - 6x

x - 3.y = 15
x - 3.(3 - 6x) = 15
x - 9 + 18x = 15
19x - 9 = 15
19x = 15 + 9
19x = 24
x = 24
     ------
      19

y = 3 - 6x
y = 3 - 6.24
              -----
               19

y = 57 - 144
      -------------
           19

y = - 87
      --------
         19