If using the method of completing the square to solve the quadratic equation x^2-6x7=0, which number would have to be added to "complete the square"?

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

answer: i realy don't get it that much can you me figer it out pleas you

step-by-step explanation:

1. perpendicular

2. parallel

3. perpendicular