Someone help me with these questions

Question 1 TRUE or FALSE. If f(a) = f(b), then a = b. Tries remaining: 1 Select one: Marked out of O True 1.00 O False Flag question Check Question 2 TRUE or FALSE. A vertical line can intersect the graph of a function f(x) at most once. Tries remaining: 1 Select one: Marked out of O True 1.00 O False Flag question Check Question 3 If the tangent line to the graph of a function f(x) at x = 4 is given by the equation 6x - 3y = 15, then: Tries remaining: 3 Select one: Marked out of Of' (4) = 6 cross ou 100 Of'(4)=15 cross ou Flag question Of' ( 4 ) = 3 cross out Of' ( 4 ) = 2 cross out