Y^2 − x^2 = 100 is that a function or no?

No, it is not an equation

Step-by-step explanation:

See attached graph:

No. If you solve it for , you have

So, given a certain value for , say , you have

So, you're associating two y-values for each x value. This implies that this is not a function.

step-by-step explanation:

∆abc has the points a(1, 7), b(-2, 2), and c(4, 2) as its vertices. formed with the point d(1, 2) as its third vertex, then ∆abd is triangle.