Here's the question you clicked on:
nicole10
In order to solve a system of equation by substitution, you must always solve for y in one of the equations and then back-substitute. true or false
why cant you solve for x what is the difference
it depend on what type of unknown you use. like in your question, the unknown is in term of y.
False. You could solve for x and back substitute. Or, what if your system of equations had no y-variable Such as: a + b = 7 5a - 7b = 10