Question

2a+b+c=9 a+2b+c=8 a+b+2c=11

Answer 1

$\: \: \: \: \: \:$

# 2a+b+c=9

answer

$a = \frac{9}{2} - \frac{1}{2} b - \frac{1}{2} c$

#a+2b+c=8

answer

$a = 8 - 2b - c$

#a+b+2c=11

answer

$a = 11 - b - 2c$

refer to the attachment for explanation

hope it helps