When x = 4 and y = 3, find the value of: a) 2x + 7y - 10
b) y(x - 2y)
c) (5y - 3x)/12
PLEASE HELP
PLEASEE​

Will mark determine whether the conjecture is true or false. give a counterexample for any false conjecture. given: points r, s, and t conjecture: r, s, and t are coplanar. a) false; the points do not have to be in a straight line. b) true c) false; the points to not have to form right angles. d) false; one point may not be between the other two.