Precalculus (10th Edition)

$X_{max}=30,X_{min}=-90,Y_{max}=70,Y_{min}=-50,X_{scl}=10,Y_{scl}=10.$
If we select: $X_{min}$ to be lower than all x-coordiantes of the points, $X_{max}$ to be greater than all x-coordiantes of the points, $Y_{min}$ to be lower than all y-coordiantes of the points, $Y_{max}$ to be greater than all y-coordiantes of the points, $X_{scl}=10, Y_{scl}=10$ then we get a good solution. Thus $X_{max}=30,X_{min}=-90,Y_{max}=70,Y_{min}=-50,X_{scl}=10,Y_{scl}=10.$