exam Maths Puzzle Numerical Ability

how do i know when to use setbuilder notation or lnterval notation m+4>8

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exam Other Question

A man and his brother have a combined age of 164 years. 46 years ago, the man was 7 times as old as his brother. How old is the man? How old is the brother? Please help me with graphing these problems.

I do not understand how to do this.

a y>-2
b y>2x-2
c 4x-6y<12

Thanks