Question

x+y=337
x-y=43 qqual e

Answer 1

X+y=337 x-y=43  .(1)


x+y=337
1x-1y=43


Somando e subtraindo:

x+1x/y-1y/337+43
 2x      0    380

2x=380
x=380/2
x=190


Voltando ao sistema anterior:

x+y=337
190+y=337
y=337-190
y=147