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b

${y=x−2y=6x+2 $ Since both of the equations are given in a slope-intercept form, we can graph them in a coordinate plane.

The solution to the system is where the two lines intersect.

Therefore, the solution is $(-2,-4).$

c

In part A, the solution is only determined by the value of $x$ because there is no other variable involved. In part B, we have two variables which both have to satisfy the two equations in order to be a solution. This is the difference, that the solution to a system of linear equations is always given as a point.