Y=x+1
y=x^2-1

i don't understand

ANSWER

The solution is

EXPLANATION

We have

and

Let us substitute equation (1) in to equation (2). This gives us,

We rewrite this as a quadratic equation as the highest degree is 2.

This implies that

we factor to obtain,

This means,

We substitute this values into any of the above equations, preferably equation (1)

When, ,

When, ,

The solution is

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.

i do not know this sorry : (