Susan works part-time in a local video store. Her salary varies directly as the number of hours worked. Last week she earned $144 for working 16 hours. This week she earned $378. How
many hours did she work this week?

Around 2.63

Step-by-step explanation:

144 x 2.63 = 378.72

I would put 2.60, but you do you

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.