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1) 2a - 3b = 5 ----->*1
2) 3a - b = 3 ----->*-3
1) 2a - 3b = 5
2) -9a + 3b = -9
____________
-7a + 0b = -4
-7a = - 4
a = -4 / -7
a = 4/7 ----------->Este es el valor de "a"
Buscamos "b" en cualquiera de las otras ecuaciones
2a - 3b = 5
Reemplazamos:
2(4/7) - 3b = 5
8/7 - 3b = 5
-3b = 5 - (8/7)
-3b = 27/7
b = 27/7 ÷ -3
b = -9/7 -------------->Este es el valor de "b"