Write a matrix to represent the system 2a - 3b = 6
a + b = 2

A.
2 -3 6
1 1 2

B.
2 1 -3
1 6 2

C.
a b 6
a b 2

D.
2a -3b 6
a b 2

answer: it's upside down and i can't read it

step-by-step explanation:

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