I don’t know how to do this

Which of the following system of equation is not equal to the system of equations is not equal to the system of equations shown below

Type the correct answer in the box. consider the system of linear equations below. rewrite one of the two equations above in the form ax + by = c, where a, b, and c are constants, so that the sum of the new equation and the unchanged equation from the original system results in an equation in one variable.

Select the correct answer and solve for y