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If I was asked to think of a number and multiply it by 2, I could
write this algebraically as 2x,
Write the following algebraically, using x as your unknown.
"I think of a number, multiply it by 3, add 4 and square the result."

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check above link.

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.