Question

10. For the following questions, use the system of equations (1 point each):

a. Solve the system of equations using either the substitution method or the multiplication/addition method.



















b. Check your solution by writing the system as a matrix equation and using the inverse matrix.



















c. Verify your solution by graphing the system. Mark the point on your graph that represents the solution.

Answer 1

Case in point

Answer 2

i did the begining and i got x=4 and y=1 but im not sure how to check that using a matrix equation

Answer 3

You didn't post the whole problem

Answer 4

I don't see any of the equations

Answer 5

oh awkward 3x+2y=14 2x-4y=4

Answer 6

I normally solve these by solving both equations for y, setting them equal to each other:
y = y, and then finding x first, then y. If you do it that way, verifying them will be as easy as substituting x and y into the original equations and making sure you get two equal expressions in the end.

Answer 7

right but i had to solve using substitution and i got my answers and i checked them the way i normally do but i dont know how to check them using a matrix equation

Answer 8

I don't even know how to set up a matrix equation. I personally hate matrices

Answer 9

But I can find out how to do it.

Answer 10

YOUR MY FAVORITE PERSON THAT IVE NEVER MET BEFORE lol

Answer 11

gr man any idea how to verify the solution i got using a graph?

Answer 12

yeah....if you solve both equations for y, you can actually graph that. That is the whole point of my method of solving...to end up graphing them in terms of y to verify the algebraic solution is correct.

Answer 13

you people just couldn't have finished this -_-