Resposta :
Resposta:
x+y=52 (i)
x-y=12 (ii)
(i) + (ii)
2x+0=64
2x=64
x=64/2
x=32
Resposta:
x+y=52 (i)
x+y=52 (i)x-y=12 (ii)
x+y=52 (i)x-y=12 (ii)(i) + (ii)
x+y=52 (i)x-y=12 (ii)(i) + (ii)2x+0=64
x+y=52 (i)x-y=12 (ii)(i) + (ii)2x+0=642x=64
x+y=52 (i)x-y=12 (ii)(i) + (ii)2x+0=642x=64x=64/2
x+y=52 (i)x-y=12 (ii)(i) + (ii)2x+0=642x=64x=64/2x=32