There is a bag with only red marbles and blue marbles. The probability of randomly choosing a red marble is

5

8

.

There are 56 marbles in total in the bag and each is equally likely to be chosen.

Work out how many red marbles there must be.

What number is:

5

8

. please because probability cannot be greater than 1.

i think it is c, not positive though

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.