Is x=9 a solution to the equation: 50−x=30

no the solution would be x= 20.

Step-by-step explanation:

50-x=30

-x=30-50

-x=-20

x=20

No, x=9 it's not the right solution.

Step-by-step explanation:

Because :if x=9 the equation would be like 50-x=41 and not 30.

But in these case it's like :50-x=30

                                          50-30=20 and not 9.

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.