Question

A+b =5 and 3a +2b = 20 the the value of a+ b

Answer 1

Step-by-step explanation:

b=5-a

3a+2b=20

3a+2(5-a)=20

3a+10-2a=20

3a-2a=20-10

a=10

b=5-10=-5

b=-5

a+b=10+(-5)=5

Answer 2

The final value of a+b = 5

Step-by-step explanation:

$\ Given \ value:\\\\A+b =5 \\\\3a+2b\\\\\ Find\\\\a+b= ?\\\\\ Solution:\\\\\texttt{In the given question a+b value already is given} \\\\\texttt{, that is = 5 so, the answer is 5}$

$\ It \ can \ also \ be \ find \ as \ follows:\\\\\ a+ b=5 ...(i)\\\\\ 3a +2b = 20 \\\\\ Solve \ equation: \\\\ b=5-a .....(a)\\\\\ put \ the \ value \ b \ in \ equation \ (ii) \\\\ 3a+2b=20 \\\\3a+2(5-a)=20 \\\\3a+10-2a=20 \\\\3a-2a=20-10 \\\\a=10\\\ put \ value \ of \ a \ in \ equation \ (a) \\\\ b=5-10=-5 \\\\b=-5 \\\\a+b=10+(-5)=5$

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