Solve 10(1 + 3b) = −20, justifying each step with an algebraic property.

Ineed if you could explain and give me the answer you! this needs done

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.

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827