Question

zicetimi va rog cum rezolv a+b=72 a=b + 12

Answer 1

a + b = 72

a = b + 12

__________

b + 12 + b = 72

2b = 72 - 12

2b = 60

b = 60 : 2

b = 30

a = 30 + 12

a = 42

Answer 2

$a + b = 72$

$a = b + 12$

$b + 12 + b = 72$

$b + b = 72 - 12$

$2b = 60$

$b = 60 \div 2$

$b = 30$

$a = b + 12$

$a = 30 + 12$

$a = 42$