If the following system of equations was written as a matrix equation in the form ax=c , and matrix a was expressed in the form

a=[acbd]
find the value of a-b+c+d
4x + 2y=7
5x-6y=9

Marcus needs to rewrite f(x) = x2 + 6x + 4 in vertex form.

Asays "we are both knaves" and b says nothing. exercises 24–31 relate to inhabitants of an island on which there are three kinds of people: knights who always tell the truth, knaves who always lie, and spies (called normals by smullyan [sm78]) who can either lie or tell the truth. you encounter three people, a, b, and c. you know one of these people is a knight, one is a knave, and one is a spy. each of the three people knows the type of person each of other two is. for each of these situations, if possible, determine whether there is a unique solution and determine who the knave, knight, and spy are. when there is no unique solution, list all possible solutions or state that there are no solutions. 24. a says "c is the knave," b says, "a is the knight," and c says "i am the spy."

Solve -2(4y + 6) = 52. 5 -5 8 -8 and !