The given problem is an application of 2 linear equation.
In mathematics, linear equation define as any equation that can be written in the standard form of ax + b = 0. where a and b are real numbers.
System of linear equation is a collection of two or more linear equations involving the same set of variables. One method to solve for unknown variables is graphing the equation. The intersection point of two lines is the value of two unknown variables.
In this case, you can graph the two equation 3x +y = 2 and 2y = 15 - 6x. When you graph the two, it results a parallel line, parallel line also have the same slope.
