for an isosceles right triangle the legs would be 2 times the square root of the hypotenuse
so for this:
the legs would be 2sqrt(10)
True: The trigonometric ratios sine and secant are reciprocals of each other
(2-8)/(4+6)
-6/10
-3/5
slope is -3/5
2x+7y=4
+(-2x-8y=-2)
------------------
0x-y=2
-y=2 (this is the result of adding the two equations)
But...
y=-2
2x+7(-2)=4
x=9