Resposta :
a) incognita x, coeficiente a = 4, coeficiente b = -4, coeficiente c = 1
b) incognita z, coeficiente a = 3, coeficiente b = 2, coeficiente c = 1
c) incognita y, coeficiente a = -1, coeficiente b = 1, coeficiente c = 12
b) incognita z, coeficiente a = 3, coeficiente b = 2, coeficiente c = 1
c) incognita y, coeficiente a = -1, coeficiente b = 1, coeficiente c = 12