Imagine we conduct a study to determine how long it takes salesclerks to approach and help hearing-disabled customers. If differences do emerge between these two IV levels, can we say confidently that the differences are due to deafness, or might there be another variable at play (like chance) that better accounts for any observed differences? As your Pause-Problem, think of two factors that account for why helping times might differ between conditions (other than deafness vs. hearing)

answer: no, but if it does it's a obvious pattern.

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alright well the answers to your question is

2xy/9 hope this have a nice day : )

step-by-step explanation:

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.