PLS HELP THIS IS MY LAST 2 TEST QUESTIONS find the ​solution as ordered paired points

4x+5y=19 , x+5y=16 ​

−x+y=2 , 2x+y=8

Quick translate "x is 12 units from 20" into an equation. what are the values of x being described? if you can answer any of my other questions that'd be great too

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

The formula for the lateral area of a right cone is la = rs, where r is the radius of the base and s is the slant height of the cone.which are equivalent equations?