Find positive numbers x and y satisfying the equation xy=20 such that the sum 4x+y is as small as possible.

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Abarbecue sold 26 hamburgers and hot dogs. hamburgers sell for $3.50 each and hot dogs sell for $2.00 each. if the barbecue made $70 in sales, determine and state the number of hot dogs sold.

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2