Question

is (-1,-1) (1,3) equal 3--1 over 1--1 = 4/2 = 2?

Answer 1

\[\left[\begin{matrix}3 & +1 \\ 1& +1\end{matrix}\right] = \left(\begin{matrix}4 \\ 2\end{matrix}\right)\]

Answer 2

which equals 2

Answer 3

you mean slope right?

Answer 4

he got me confused here!!

Answer 5

its just those y2-y1 over x2-x1 equations

Answer 6

(-1,-1) (1,3) represents 2 points on a graph right?

Answer 7

wait.. let me rephrase.. forget everything i said.. Write the equation of the line through the points (-1,-1), (1,3)

Answer 8

ok!
now what you worked out is the slope the line = 2
now you use the standard equation
y-y1 = m(x-x1)
where m = slope and (x1,y1) is a point on the line
we can use any of the two points in your question
lets use (1,3)
x1 = 1 and y1 = 3
we get:
y - 3 = 2(x-1)

y - 3 = 2x - 2

y = 2x + 1

- theres the equation of your line