Describe how to verify whether expressions are equivalent, and explain the purpose of verifying equivalent expressions.

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

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.]

Solve the system of equations using the substitution method. {y=−3x+7x=−2y−16 enter your answers in the boxes.