Describe the graph of a line whose slope is negative​

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

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

A50% increase followed by 33 1/2% decrease