The third side is 84 inches long, therefore it has to be the hypotenuse because it's the longest side.
Answer:
y=-2/3+8
Step-by-step explanation:
-2/3 is the slope and 8 is the y-intercept
Remember
difference of 2 perfect squares
a^2-b^2=(a-b)(a+b)
(x)^2-(7)^2=(x-7)(x+7)
set to zero
x-7=0
x=7
x+7=0
x=-7
x=-7 or 7
