Answer:
1)
2) 
Step-by-step explanation:
Please ignore the squiggle in the middle of the page.
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Congruent triangle are the same shape and same size exactly
The vertical line test is when you put vertical lines down the graph and if the point does not touch the line more than once, it passes and represents a function.
We'll check if they're orthogonal:
u*v=0
(6,-2)*(8,24)=0
6*8+(-2)*24=0
48-48=0
0=0
they are orthogonal vectors