How is the graph of y=-6x^2+4 different from the graph of y=-6x^2

Write an equation of the line given the two points below (write your equation in slope-intercept form, y=mx+b): (-4, 4) and (6, -4)

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

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.