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y = -2x + 1

Step-by-step explanation:

To find slope, you need to use the formula:

m =

Plug in the numbers accordingly:

m =

m =

Simplify:

m = -2

To find the y-intercept, you need to plug in one of the coordinates (doesn't matter which one) into the equation:

Coordinate : (-1, 3)

3 = -2(-1) + b

3 = 2 + b

Subtract 2 from both sides:

3 = 2 + b

-2  -2

________

1 = b

Put it all together:

y = -2x + 1

2 over 5

step-by-step explanation:

the 2: 3 ratio is the length of the ac segment to the cb segment total length. this implies that the ratio between segment ac length and segment ab length is 2: 5. point c is 2/5 from a to b, so the required fraction is 2/5.

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