Lesson 10-2 slope and perpendicular lines

Which steps could be part of the process in algebraically solving the system of equations, y+5x=x^2+10 and y=4x-10

The difference of three and the reciprocal of a number is equal to the quotient of 20 and the number. find the number.

Determine the required value of the missing probability to make the distribution a discrete probability distribution. x p(x) 3 0.23 4 ? 5 0.51 6 0.08 p(4) = nothing  (type an integer or a decimal.)