Question

resolva as equações : a) 9 (x - 3 ) = 45 b) $\frac{x}{y}$

Answer 1

a) 9 (x - 3 ) = 9.x - 9.3 = 45 --> 9x - 27 = 45 ----> 9x = 45 + 27 ----> x = 72/9 = 8

b) x/y = a quanto?