Help me plz

[10 points, algebra 2]according to my answer key the restrictions are -1 and 4. but why not positive 1?

Complete the solution of the equation. find the value of y when x equals to 28 x+3y=28

(05.03 mc) part a: explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. (4 points) part b: make tables to find the solution to 4x = 2x−2. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 4x = 2x−2 graphically? (2 points)