y = 8x − 9
y = 4x − 1

Part A: Explain how you will solve the pair of equations by substitution or elimination. Show all the steps and write the solution.

Question

y = 8x − 9
y = 4x − 1

Part A: Explain how you will solve the pair of equations by substitution or elimination. Show all the steps and write the solution.

mhchen · Answer

By elimination, that means subtracting the equations together so it would be:

    y = 8x - 9
-  y = 4x - 1
______________
   0 = 4x - 8    <-- Then you can solve for x

By substitution, since y = 4x - 1, you can plug that into the first equation like:

4x - 1 = 8x - 9   <-- Then you can solve for x

mathmale · Answer

Note that the solution alone is insufficient here; you must explain in words what you must do to solve the system of equations.

mathmale · Answer

Name the method you intend to use.

ladylauren · Answer

i will use substitution.

ladylauren · Answer

8x-9=4x-1
4x-9=-1
x=2