Posted by **Joy** on Tuesday, July 30, 2013 at 6:56am.

16. What is the value of a that would make the matrix equation true?:

( 1 -2) (-5 6) (a b)

( 3 4) (7 -8) = (c d)

- Discrete Mathematics -
**Graham**, Tuesday, July 30, 2013 at 9:37am
Just multiply the matrices

a = (1)(-5)+(-2)(7)

b = (1)(6)+(-2)(-8)

c = (3)(-5)+(3)(7)

d = (3)(6)+(3)(-8)

- Discrete Mathematics -
**Joy**, Tuesday, July 30, 2013 at 1:08pm
For the matrices I came up with the following:

a. -5 + -14 = -19

b. 6 + 16 = 22

c. -15 + 21 = 6

d 18 + -24 = -6

Is this right? What am I suppose to do afterwards?

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