Step-by-step explanation:
Y = 3x + 2
Putting value of y in equation 2
x + 12 = 3x + 2
12 - 2 = 3x - x
10 = 2x
10/2 = x
5 = x
Putting value of x in equation 1
Y = x + 12
Y = 5 + 12
Y = 17
Option D is the correct answer
