Pls help me here, I need it now

The sum of two numbers is 86, and their difference is 20. find the two numbers

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The value of x in this system of equations is 1. 3x + y = 9 y = –4x + 10 substitute the value of y in the first equation: combine like terms: apply the subtraction property of equality: apply the division property of equality: 3x + (–4x + 10) = 9 –x + 10 = 9 –x = –1 x = 1 what is the value of y?