What percentage of females polled supported martinez

1. what are the missing reasons in the proof 2. it's in the second picture and 3

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36