Question

Range for the equation 2y=8-4x if the domain is (-2,-1,0,2,5)

Answer 1

$2y=8-4x\ \ \ |divide\ both\ sides\ by\ 2\\\\y=4-2x$
Put numbers from {-2; -1; 0; 2; 5} to the equation instead of x:
$x=-2\to y=4-2\cdot(-2)=4+4=8\\\\x=-1\to y=4-2\cdot(-1)=4+2=6\\\\x=0\to y=4-2\cdot0=4\\\\x=1\to y=4-2\cdot1=4-2=2\\\\x=2\to y=4-2\cdot2=4-4=0$
We have the range: {0; 2; 4; 6; 8}.