When solving the following system of equations by substitution what would be a correct first step?

{x=y- 7 3x + 15y =- 1

A. 3x + 15 (y - 7) = - 1
B. 3(y – 7) + 15y = - 1
C. 3x + 15y (y - 7) = -1
D. 3x(y – 7) + 15y = -1

the answer is a i belaeve atleast thats what my calculator just gfave me

step-by-step explanation:

3-4

step-by-step explanation:

the answer is 3-4 because both 45 and 60 has a multiple of 15.

45/3=15

60/4=15

therefore the odds against selecting a red is 4-3

answer: the anser is 3

step-by-step explanation:

c- 2o is equal to 9