Katelyn,
In the equation of the line 2x-3y=6 the x intercept is (3,0) so we
want the equation of the second line with slope of 2 to go through the point (3,0). Use y= mx +b , x=3 y=0 to find b.
0 = 2(3) +b
-6 =b
so the equation of the line is y= 2x-6. This line will intersect
2x-3y=6 , x=3.