If 2x+y=16 and 4x-y, find the value of x and y​

Josephine has a great garden with and area of 2x2 + x - 6 square feet

What is the ratio of the change in y-values to the change in x-values for this function? a) 1: 13 b) 2: 5 c) 5: 2 d) 13: 1

Prove that quadrilateral is a rhombus.