Which ordered pair (c, d) is a solution to the given system of linear equations- c+2d=13 -9c-4d=-15

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

what level of math? also i don't need to be paid if i can you.

0,0

step-by-step explanation:

answer: i think one of the answer is $150 and $300?

step-by-step explanation: