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The hypotenuse of a 45 -45 -90 triangle measure 7 square root 2 units

Tell me how you got the it use the figures to answer questions 1and 2. in each diagram, line k is parallel to line l, and line t intersects lines. 1. based on the diagrams, what is the value of x? 2. how would you verify your answer for x?

Asystem of equations has 1 solution.if 4x-y=5 is one of the equations , which could be the other equation ?