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Since it is a 45-45-90 right triangle, the formula is:
Hypotenuse= sqrt2 * leg
Since you know hypotenuse = 9sqrt2 the leg has to be 9
The answer is c y=3x-1 if you just plug in the numbers you can see if it is equal
In a line parallel to y-axis, the x would have to be constant, if it's not constant (always the same) then it won't be parallel. Constant values of y could be y=1, y=2... etc, and we have this as an option: y=5, this is the correct answer.
(1) would be parallel to x axis and 2 and 4 are diagonal or sloping lines.