I scored a 1470 on my first SAT, and a 1550 on my second SAT. Carnege mellon requires all scores to be sent. Should I submit these scores if I am applying ECE?

While they require all tests, they will primarily focus on the highest score. 1550 is solidly in the range of admitted CoE applicants, so I would submit them.

Just be sure to spell the name of the school correctly on your application.