Question

a+b+c=23   b=ax2+3 c=bx2   ????

Answer 1

$a+b+c=23 \\\\ b=2a+3 \\\\ c=2b \\\\ a+2a+3+2(2a+3)=23 \\\\ 3a+3+4a+6=23 \\\\ 7a+9=23 \\\\ 7a=23-9 \\\\ 7a=14 \ \ |:7 \\\\ \boxed{a=2} \\\\ b=2*2+3 \\\\ b=4+3 \\\\ \boxed{b=7} \\\\ c=2b \\\\ c=2*7 \\\\ \boxed{c=14}$