Help me with the image i sent

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Kylie explained that (-4x+9)^2 will result in a difference of squares because (-4x+9)^2 (-4x+9)^2 =(-4x)^2+(9)^2=16x^2+81

2x minus y equals 6, x plus y equals negative 3