Answer:
4
Step-by-step explanation:
I don't know if u want the explanation
Answer:
y = 1/2x+2
Step-by-step explanation:
Try this option:
if x+y=-9 is I (one)
and x+2y=-25 is II (two), then
if II-I, then (x+2y)-(x+y)=-25+9 ⇔ y=-16.
Answer:

Step-by-step explanation:
To find the
we must use the cosine theorem.
The cosine theorem says that:

In this case:



So



