The perimeter of an equilateral triangle is p and the length of a side is s. The formula for s is s = p = 3
Find the length of a side when the perimeter is 21 cm. = cm
Write down a formula for p in terms of s. p =

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]