Aband leader randomly selects 2 students out of 80 band members. if you and your brother are both band members, what is the probability that you are both selected?

B

Step-by-step explanation:

x = van

y = bus

12x + 9y = 456

1x + 2y = 83

(Simplify equations)

9y = -12x + 456

y = -1.3x + 456/9

2y = -x + 83

y = -1/2x + 41.5

(Find x)

-1.3x + (456/9) = -.5x + 41.5

0.8x = 9.16

(Round)

x = 11

(Find y by plugging x in)

y = -1/2(11) + 41.5

y = -5.5 + 41.5

y = 36

(Check)

12(11) + 9(36) = 456

132 + 324 = 456

1(11) + 2(36) = 83

11 + 72 = 83