A recent study asked a random sample of 250 college-aged adults about their plans for purchasing a new computer. Of the sample, 42% said they plan to purchase a Mac computer within the next year. A 90% confidence interval for the true proportion was found to be (36.9%, 47.1%). What is the margin of error?

sss (side, side, side)

sas (side, angle, side)

asa (angle, side, angle)

aas (angle, angle, side)

hl (hypotenuse, leg)

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

my guess would be b and d, but i didn’t actually get out the pen and paper. lol