Răspuns :
ax+ay -8=100
a(x+y)-8=100
a*12=100+8
12a=108
a=108:12
a=9
a-(x+y-7)= 9-(12-7)= 9 -5=4
a(x+y)-8=100
a*12=100+8
12a=108
a=108:12
a=9
a-(x+y-7)= 9-(12-7)= 9 -5=4
ax+ay-8=100 ⇒ a(x+y)-8=100
x+y=12
a·12-8=100
12a-8=100
12a=108 ⇒a=108/12=9
a-(x+y-7)=9-(12-7)=9-5=4
x+y=12
a·12-8=100
12a-8=100
12a=108 ⇒a=108/12=9
a-(x+y-7)=9-(12-7)=9-5=4