I'm

solve the systems:

a. y=50+3x

y=100-2x

b. x+3y=9

-3x+2y=8

for

(will give brainliest < 3)

The first step that isn’t show here is expressing the system in standard form. I assumed you would already know how to do that so I didn’t include it
As for the second system, I’d be happy to give you a solution for that as well, but I can only post one photo per question so you would have to post it again :)

6/ 11 = 0.545454 so your answer is55%