What strategies can be used to find solutions for equations such as 2,000 = 20x + 10y?

What is the solution of sqrt x+2-15=-3

State whether weight is a function of height for the six students and explain. a. yes, height is a function of weight because two students weigh 165 pounds but have different heights. b. no, height is not a function of weight because two students weigh 165 pounds but have different heights. c. yes, weight is a function of height because for each value of height there is one corresponding value of weight. d. no, weight is not a function of height because there is not enough data to determine a function.

Aquadratic equation in standard from is written ax^2= bx+c, where a, b and c are real numbers and a is not zero?