Question

Решите систему (x+7)/3-(y-8)/5=3
(x+5)/4+(y+9)/3=5

Answer 1

3(х+5)+4(у+9)=60
3х+15+4у+36=60
3х+4у+51=60
3х+4у=9
х+4у=3
х+у=3/4
х+у=0,75