What is the value of y if (3,y) is a solution to the equation 5x-3y=18

y= -1

Step-by-step explanation:

Because you have the point (3,y), you now know that x is 3 because coordinates come in (x,y) forms. So you would plug in 3 for x. 5(3)-3y=18. Then continue to solve by subtracting 15 from both side and getting -3y=3. Divide from -3 on both sides and get y= -1

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