Question

Find the y-coordinate in the system below.
y + 3x = -21
x=3y + 3
28

Answer 1

To find the y-coordinate, substitute the value of 'x' from the second equation into the first equation and solve for 'y'.

Step-by-step explanation:

To find the y-coordinate in the given system of equations:

y + 3x = -21

x = 3y + 328

1. Substitute the value of 'x' from the second equation into the first equation:
   y + 3(3y + 328) = -21
2. Simplify and solve for 'y':
   y + 9y + 984 = -21
   10y + 984 = -21
   10y = -21 - 984
   10y = -1005
   y = -1005/10
   y = -100.5

Therefore, the y-coordinate in the system is -100.5.