Find x if the perimeter is 23.
2x+1
3x-5
4x

perimeter is the length of all sides added up so we add the expressions

(2x + 1) + (3x - 5) + (4x) = 9x-4

9x - 4 = 23

now work backwards

add 4 to 23 to get rid of -4

9x = 27

now divide by 9 to get x

x = 3

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graphically?   well, you graph them both, the solutions is where they both intersect each other, since there are two solutions, meaning they will meet twice, or namely the linear will run into the quadratic curve twice, and where they meet, those x,y coordinates are the solutions to the system.