We have to put values of domain to find range
[tex]\\ \ast\sf\longmapsto y=-2x+5[/tex]
[tex]\\ \ast\sf\longmapsto D_R=[-2,2,4][/tex]
[tex]\\ \ast\sf\longmapsto y=-2(-2)+5=4+5=9[/tex]
[tex]\\ \ast\sf\longmapsto y=-2(2)+5=-4+5=1[/tex]
[tex]\\ \ast\sf\longmapsto y=-2(4)+5=-8+5=-3[/tex]
Now
[tex]\\ \ast\sf\longmapsto R_R=[9,1,-3][/tex]
