Question

Find a and b 

    a-b=3

   2a+3b=36
​

Answer 1

Answer:

a-b=3

a= 3+b

2a+3b=36

2(3+b)+3b=36

6+2b+3b=36

5b=30

b=6

a=3+6

a=9

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Answer 2

Step-by-step explanation:

QUESTION ASKED ;

Find the value of a and b.

a - b = 3

2a + 3b = 36

METHOD TO DO :

It can be solve by many way,

• Elimination method
• Substitution method

BY USING SUBSTITUTION METHOD ;

a - b = 3

a = 3 + b .......1st equation

2a + 3b = 36 ........2nd equation,

By substituting the value of a in 2nd equation,

2( 3 + b) + 3b = 36

6 + 2b + 3b = 36

6 + 5b = 36

5b = 36 - 6

5b = 30

b = 30/5

b = 6

Now , substituting the value of b in equation 1st,

a - 6 = 3

a = 6 + 3

a = 9

Hence,

A = 9 and B = 6 answer