book Maths Puzzle Numerical Ability

Can you please show me how to work this problem out?

2a+b=14
3a+b+4

(this is one problem.)

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book Other Question

What is the shortest distance from the point (-1, 11/3) to the line 2y=3x+6? The width of a rectangle is one third of the legnth. If the perimeter is 96, Find the width.