K=6.5
We move all terms to the left:
k-(6.5)=0
We add all the numbers together, and all the variables
k-6.5=0
We move all terms containing k to the left, all other terms to the right
k=6.5
As it is straight angle so it's answer will be 180.
Step-by-step explanation:

• y2 → -1
• y1 → 5
• x1 → 4
• x2 → -3

To simplify this expression you would factor out the greatest common factor which is y^2.
9y^2 - 11xy^2 -----> Factor out y^2
y^2(9 - 11x) ----> This should be as far as you can go, meaning this is your final answer!
Hope this helps!