Find the inverse of {(4, -1), (3, -2), (6, 9), (8, 5)}.

A∣=3(8−7)+1(−2−4)=3−6=−3

co-factor matrix =

⎣

⎢

⎢

⎡

−1

5

3

−4

23

−11

1

−11

−6

⎦

⎥

⎥

⎤

Adj.A=

⎣

⎢

⎢

⎡

−1

−4

1

5

23

−11

3

12

−6

⎦

⎥

⎥

⎤

A

−1

=

∣A∣

1

Adj.A=

3

−1

⎣

⎢

⎢

⎡

−1

−4

1

5

23

−11

3

12

−6

⎦

⎥

⎥

y-y1=4(x-x1)

step-by-step explanation:

this is point-slope form since you only have 4 as the slope it goes in place of m

hope this : )