Answer:
here,x=123, is the answer.
Well the answer options are a bit confusing but the steps are 1, 2, & 3.
Step-by-step explanation:
given
3x + y = 9
Writing In slope intercept form , y = mx + c
y = -3x + 9
comparing the given equation with y = mx + c
slope (m) = - 3
y-intercept (c) = 9
Hope it will help :)