Respostas

2014-02-20T10:48:24-03:00
2014-02-20T10:59:58-03:00
 \left \{ {{x+y=183} \atop {y=x+1}} \right.
x+y=183
y=x+1

x +(x+1) =183
x+x+1=183
2x+1=183
2x+1-(+1)=183-(+1)
2x+1-1=183-1
2x=183-1
2x=182
 \frac{2x}{2}= \frac{182}{2}
x= \frac{182}{2}
x=91

x+y=183
91+y=183
91+y-(+91)=183-(+91)
y=92