What is the relationship between the solution of an equation in two variables and its graph?

 A relationship that occurs when variable quantities are directly proportional to one another. A linear relationship can be represented on a graph as a STRAIGHT LINE. 

Linear relationships always follow the formula: 

y=mx+b 

where y is the value of the y-coordinate, 
where my is the slope of the line, 
where x is the value of the x-coordinate, 
and b is the y-intercept

the annnswr is 14.24 degrees