exam Maths Puzzle Numerical Ability

I have a TI84 plus graphing calculator> Could someone please explain to me how to use it in regards to graphing linear equations Thanks

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exam Other Question
sixty-two feet of fencing was used to enclose a rectangular pen that was 11 feet wide. How long was the pen? 2x+5-3(x+7)=4-6x

(x+2)(3x-5)=3x(x-8)+15