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Use the same y coordinate.
For x, solve
4+2x=2:
Use your last y coordinate again.
x is the negative
square root of 9:
Find the positive difference between those coordinates
for your new y.
For x, solve -3-2x = 5x+4:
Subtract 2 from both coordinates:
Add your coordinates for x.
For y, solve
(y+1)(y-1)=-1:
Solve y = x-4 and y = -5+2x.
Then add the previous
x coordinate to the new one:
Add the last coordinates together to give x.
y is
the only even prime number:
Solve the equations y=2x+1 and y=x+2:
Make the y coordinate your last x coordinate.
The x
coordinate is the opposite: