What is the slope of the line x = 4?

Solve the system of equations. y= 2x y= x^2 - 15

Two blends of tea are mixed to make a blend that will be sold at the fair. black tea sells for $2.20 per pound and orange pekoe tea sells for $3.00 per pound. how much of each should be used to obtain a 4lb blend selling for $2.50 per pound?

What are “like terms”? why can we only add like terms?