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Please solve the 3rd and the 4th one.

**2. **Find the value of a and b for which each of the following systems of linear equations has a infinte number of solutions :

$3.2x+3y=7;\left(a+b+1\right)x+\left(a+2b+2\right)y=4\left(a+b\right)+1.\phantom{\rule{0ex}{0ex}}\phantom{\rule{0ex}{0ex}}4.2x+3y=7;a\left(x+y\right)-b\left(x-y\right)=3a+b-2\phantom{\rule{0ex}{0ex}}$

Refer to the link for question 3

https://www.meritnation.com/ask-answer/question/find-the-values-of-a-and-b-for-which-each-of-the-followin/math/12109449

For remaining question kindly post in separate thread for meaningful help.

Regards

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