This is a system of equations. Yippee :P
y = x^2 - 4
re-arrange the second equation:
y + x^2 = 4
y=-x^2+4
Go to Y=x^2-4
Down button, y=-x^2+4
Graph (upper right hand, under screen)
Also, make sure all of your plots above are not darkened.
Now, the interesection of both lines is the solution to the system. Go to graph.
2nd->Trace->5
Curve 1?: enter Curve 2?: enter
x=2 and x=-2 for this system.
y = x^2 - 5x + 8
y = -x^2 + 7x - 10
This one I would use the graphing calculator for.
Go to Y=x^2-5x+8
Down button, y=-x^2+7x-10
Graph (upper right hand, under screen)
Also, make sure all of your plots above are not darkened.
Now, the interesection of both lines is the solution to the system. Go to graph.
2nd->Trace->5
Curve 1?: enter Curve 2?: enter
x=2.9999992 which really just means x=3 for this system. (the reason being that it rounds up due to those tricky pixels
