2x + 3y = 21
3y = -2x +21
y = (-2/3)x + 7
The slope of this line = -2/3....so a parallel line has the same slope
So
(-9 - 7) / ( j - 2) = -2/3
-16 / ( j - 2) = -2/3 cross-multiply
-16 * 3 = -2 ( j - 2)
-48 = - 2j + 4
-48 - 4 = - 2j
-52 = -2j
j = -52 / -2 = 26
