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

Question

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

anonymous · Answer

true..

anonymous · Answer

why cant you solve for x what is the difference

anonymous · Answer

it depend on what type of unknown you use. like in your question, the unknown is in term of y.

anonymous · Answer

thanks

directrix · Answer

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