Question

HELP!!!

a - b = d + c
b - a = c + d
c + d = b - a

Answer 1

Respuesta:

a) $a-b=d+c$

$a-b+b=d+c+b$

$a=d+c+b$

b)$b-a=c+d$

$b-a-b=c+d-b$

$-a=c+d-b$

$\frac{-a}{-1}=\frac{c}{-1}+\frac{d}{-1}-\frac{b}{-1}$

$\frac{-a}{-1}=\frac{a}{1}=a$

$\frac{c}{-1}+\frac{d}{-1}-\frac{b}{-1}=\frac{c+d-b}{-1}=-\frac{c+d-b}{1}=-\left(c+d-b\right)=-\left(c+d-b\right)=-c-d+b$

$a=-c-d+b$

c) $c+d=b-a$

$c+d+a=b-a+a$

$c+d+a=b$

$c+d+a-\left(c+d\right)=b-\left(c+d\right)$

$a=b-c-d$