Question

resolva os sistemas a+b = 20 a-b = 16​

Answer 1

a + b = 20

a - b = 16

2a = 36

a = 36/2

a = 18

a - b = 16

18 - b = 16

b = 18 - 16

b = 2

O valor de a é 18 e b vale 2.

Answer 2

Resposta:

a=18

b=2

Resolução passo-a-passo:

$\left\{\begin{array}{cc}a+b=20\\a-b=16\\\end{array}\right$

2a=36

a=36/2

a=18

$\left\{\begin{array}{cc}a=18\\18-b=16\\\end{array}\right\:\left\{\begin{array}{cc}a=18\\-b=16-18\\\end{array}\right\:\:\left\{\begin{array}{cc}a=18\\-b=-2\\\end{array}right$

$\left\{\begin{array}{cc}a=18\\b=+2\\\end{array}\right$

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