Question

If the following system of equations was written as a matrix equation in the form AX = C, and matrix A was expressed in the form A=(a c)
(b d)
Find the value of a - b + c + d:
5x+7y=7
3x-2y=9

Answer 1

please help me on this!

Answer 2

a = 5, c = 7... see a pattern?

Answer 3

not really

Answer 4

take the x's and y's out of the problem...

you have 5 + 7 = 7
3 - 2 = 9

focus left of equals sign. Match up with:

a c
b d

Answer 5

so a=5 c=7 b=3 and d=2?

Answer 6

d = -2

Answer 7

so the answer would be 5-3+7+-2? or 5-3+7-2?

Answer 8

both are correct

Answer 9

oh okay
thanks!

Answer 10

No Problem

Answer 11

okay so im typing the answer online but its saying that the format of the equation is invalid, how can I write it?

Answer 12

its asking for the value which is just one term. Add those values together.

Answer 13

ohhhh so I have to solve that equation?

Answer 14

yes

Answer 15

oh okay so its 7

Answer 16

correct