Which property justifies the following statement?

If x=4 and y=3x, then y=3 * 4 - 11

Substitution Property of Equality

Subtraction Property of Equality

Addition Property of Equality

Division Property of Equality

Solve each quadratic equation by factoring and using the zero product property. x^2 + 18x = 9x

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

Jude is making cement for a driveway. the instructions show the amount of each ingredient to make 1 batch of cement. complete each statement to adjust the ingredients for each new situation if jude uses these instructions.