Question

resolva <br /> 3x-2y=7<br 4x-y=10

Answer 1

3 x - 2 y = 7
3 x = 7 + 2 y
x = (7 + 2 y ) /3

4 x - y = 10
4 x = 10 + y
x = (10 + y ) / 4
(7 + 2 y ) / 3 = (10 + y ) / 4
m.m.c = 12
4(7 + 2 y ) /12 = 3(10 + y ) / 12  eliminar o denominador
28 + 8 y = 30 + 3 y 
8 y - 3 y = 30 - 28
5 y = 2
y = 2/5

x =( 10 + y)/4
x = 10 + 2/5)/4
x = (50/5 + 2/5 ) / 4
x = 52/5 / 4
x = 52/5 x 1/4
x = 52/20  =  13/5