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ax - 5y = 3a
a*2 - 5*1 = 3a
2a - 5 = 3a
-5 = 3a - 2a
a = -5
a + 1 = -5 + 1 = -4
2.
2 (3x-2) +4 (y+3)= - 4
6x - 4 + 4y + 12 = - 4
6x + 4y + 8 = - 4
6x + 4y = - 4 -8
6x + 4y = -12
salah satu penyelesaian :
x = -14 y = 2
( -14, 2)