The system of equations is coincident.

What are the missing values?

3x+y=7
9x+(blank) y=(blank)

Question

The system of equations is coincident.
 
What are the missing values?
 
3x+y=7
9x+(blank) y=(blank)

directrix · Answer

If the system is coincident, the two lines are the same line and coincide at every point.

The equation of one of them must be identical to the other after the common factors of the coefficients are divided out.

directrix · Answer

Your task is to put those coefficients back in.

3 x+y=7 --- Multiply each term by 3 --->   9x + 3*3y  = 3*7

 9 x+(blank) y=(blank)

directrix · Answer

9x + 3*3y = 3*7

9 x+( 9 ) y   =    (blank)

Finish it, okay?  @DudeISuckAtThis