Which system of equations has the same solution as the system
below?
2x + 2y = 16
3x - y = 4
(1) 2x + 2y = 16 (3) x + y = 16
6x - 2y = 4 3x - y = 4
(2) 2x + 2y = 16 (4) 6x + 6y = 48
6x - 2y = 8 6x + 2y = 8

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth