What is the most efficient way to solve this system of equations, and why?
3x+4y=-1
y=-x

answer: expected value of x = 1.0

step-by-step explanation:

p(x=0) = 0.25

p(x=1) = 0.50

p(x=2) = 0.25

expected value for x = 0×0.25 + 1×0.5 + 2×0.25 = 1.0

6 spoons of sugar for every 21 cups of flour

step-by-step explanation: