Question

I took a guess on this, and I got it write. I want to know how to do this though. Can someone show me?? Thanx in advance!!:)
Solve the system using matrices.
3x + 4y = 18
3x + 4y = 18

Answer 1

@ganeshie8

Answer 2

How did YOU do it?

Answer 3

I didn't solve it. I just guessed on it.

Answer 4

you have the same equation (the equation of a line)

as background:
if you have two *different* equations (of lines), the only place where the same (x,y) pair work for both lines is at the spot where the lines cross. That point will be on *both* lines, and it is the solution to both lines at the same time.

If you have 2 equations that are really the same line, then all (x,y) points will be solutions (i.e. because you have the same line, a point on one of them is (obviously?) on the other)
you get an infinite number of solutions.

Answer 5

That's what my teacher gave me on my homework. Thanx soo much though. I need help on this one though.

Answer 6

I don't really understand this one. @phi

Answer 7

yes, that is a mouthful
if we concentrate on p->q
p= puppy behaves well
q= owners are happy

we can interpret p->q into English as
if p then q

if puppy behaves well then owners are happy

the tilde out front negates this statement
~( p -> q) means NOT (p -> q)
or
NOT (if puppy behaves well then owners are happy)

translating NOT into more standard phrasing "it is not the case that"
we get
it is not the case that if puppy behaves well then owners are happy

Answer 8

So it would be B?

Answer 9

IT is cramer's rule by the way, do you know it

Answer 10

Never Mind!!:) I got it!!:) I appreciate all of your help!!:) Both of ya'll!!:)