Yvette encoded a secret phrase using matrix multiplication. Using A = 1. B = 2. C = 3, and so on, she multiplied the clear text code for each letter by the matrix C=(shown in picture) to get a matrix that represents the encoded text. The matrix representing the encoded text is (shown in picture)
What is the secret phrase? Determine the location of spaces after you decode the text.

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

you save $70

discount would be 35% off

step-by-step explanation:

4

step-by-step explanation: