John was told that his IQ score was 3 standard deviations above the mean. If IQ scores were approximately normal with μ=93 and σ=9, what was John's score? Do not include units in your answer. For example, if you found that the score was 93 points, you would enter 93.

9 is the standard deviation in this problem. The mean iq score is 93.

This meant that his IQ score is 93+9*3=93+27=120 :) also this john person is really smart im jealous :(

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.