When you have a problem like this, all you have to do is remember that a minus multiplied by a minus is a positive and a minus multiplied by a positive is negative. Since there are five minus signs, the answer is -p.
It is -p... think about it.... two negative signs equal a positive sign, if there are an odd number of negative sign's the real answer is -p, and if there is an even amount, it means it is positive p. In your situation, there are 5 negative signs, so since 5 is an odd number, the p has to be negative.
Basically the question is asking YOU when you hear “system of equations” what do you think about it - what do you already know about system of equations. Basically. Btw enjoy this picture.
