Question

part b in the pic yo!

although im about to get help off laplace too... so for kicks

Answer 1

determinant formula = a.d-b.c where a,b,c,d are parts in the matrix reading left to right row by row
for a 2x2 matrix

Answer 2

hey
sorry i got disconnected

Answer 3

i was beginning to wonder

Answer 4

can you send me the retricedf again

Answer 5

http://www.maths.uq.edu.au/courses/MATH1050/2011/retrice.pdf

Answer 6

ok so do you get AX = B,
so -x + 2y = 2,
x - 2y = 1

Answer 7

yeah i can get that far

Answer 8

hm i guess you got disconnected again, if you make it back im still in twiddle

Answer 9

do you have twiddla?
link

Answer 10

thats an idea

Answer 11

http://www.twiddla.com/545596