Hello please help me with this :D

ASAP

X+ y = 5 ; x - y =3 solve using linear combination

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

Write the equation of the circle centered at (10,-2) with radius 2.