A candidate scored 32 marks out of 80.find his percentage score

40%

Step-by-step explanation:

Take the amount over the total

32/80

.4

Change to percent form by multiplying by 100

40 %

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.