Answer:
28.6
Step-by-step explanation:
12^2+x^2=31^2 solve for x to get 28.6(rounded)
Explanation
when you have two lines in a graph, the solution is the point where the line intersect each other, so to solve this we need to find that point
so, the answer is

I hope this helps you
Answer:
1) x-2y 2) 2(13a-5)
Step-by-step explanation:
1) -1/2(-2x+4y)=2/2x-4/2y=x-2y
2) 26a-10=2(13a-5)
Step-by-step explanation:
x greater than 9 AND x smaller than 9
x smaller than than 9 OR x greater than 9
x greater than or equal to 9 AND x smaller than or equal to 9
x smaller than or equal to 9 OR x greater than or equal to 9
I dunno if this is what you asked^^