On #4 I need help. It’s geometry. Pleaseee help!

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if