What restriction, if any must be placed on the constants to make sure that there is a unique solution to the system?

Example : ax + y = b
bx + y = a

If sin θ=24/25 and 0 less than or equal to θ less than or equal to π/2, find the exact value of tan 2θ. answers; a) -527/336 b) -336/527 c)7/24 d) 24/7

Two parallel lines are crossed by a transversal.what is value of x

Problem fathi wants to print out a pdf document that is 48 pages long. to save paper, he decides to print on both sides of each sheet and to print two pages on each side of the sheet. how many sheets of paper will he need?