Please answer all six

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20

The owner of a coffee shop compared the amount of hot coffee per day, in fluid ounces, sold and the daily high temperatures, in degrees fahrenheit, per day. her data are shown in the scatter plot below

Prove a quadrilateral with vertices g(1,-1), h(5,1), i(4,3) and j(0,1) is a rectangle using parallelogram method one midpoint formula