What is the solution of this linear system?

a.
(-2, 7)
b.
(-2, -7)
c.
(2, 7)
d.
(2, -7)

Find the given elements if matrix d:

You are on a cycling trip around europe with friends. you check the weather forecast for the first week. these are the temperatures for the week. sun mon tues wed thurs fri sat 16°c 20°c 24°c 28°c 28°c 23°c 15°c what is the mean temperature forecast for the week?

It says factor each expression completely 8y+48