Question

Stiind ca ax + ay - 8 =100 si x+y=12 calculatii a-(x+y-7)

Answer 1

ax+ ay -8 =100
ax+ ay= 108
a(x+y)= 108
a · 12= 108
$a= \frac{108}{12}$
a= 9 

a- (x+y-7) = 9-(12-7) =9-5=4