Answer:
y=2.6
Step-by-step explanation:
y/4=1.3/2
cross product
4*1.3=y*2
5.2=2y
y=5.2/2
y=2.6
Explanation
Let's first graph the elements:
Using the distance formula we get:

If you use the slope formula, the answer is m = 2
Imagine a corner of a cube.
It is made of three planes interesting at a single point
The image should help.