Question

a + b = 78
a - 2b = 22
find a and b?
Plz show step by step and I will mark it the branliest answer..
Plz answer....​

Answer 1

Step-by-step explanation:

a + b = 78

a - 2b = 22

substitution method

a = 78 - b

78 - b - 2b = 22

-3b = 22 - 78

- 3b = - 56

b = -56/-3 = 56/3

a = 78- 56/3

a = 234 - 56/3

a = 178/3

Answer 2

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a+b=78 ------------> equation(1)

a-2b=22-----------> equation(2)

subtract 1 and 2

a + b = 78

a - 2b = 22

(-) (+) (-)

--------------------

0 + 3b = 56

-----------------

3b=56

b = 56/3

b= 18.66

b = 18.7

similarly,

a + b = 78

a + 18.7 = 78

a = 78 - 18.7

a = 59.3

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