12-13 year olds onl Zoom meet HMU if you want the code

What is the solution to the system of the equations? x = y - 3 x + 3y = 13

Multiplying an even number of negative numbers gives an answer that is choose from:

5× 1/2 = ? a) more than 5 because you are multiplying by a whole number b) 5/10 because you multiply the numerator and denominator by 5 c) less than 5 because you are multiplying by a number that is more than 1 d) less than 5 because you are multiplying by a number that is less than 1