How do you find the domain and range of ##y = 2x - 1##?

Domain: ##(-oo, +oo)## Range: ##(-oo, + oo)##

Your function has no restrictions for its domain, since it's defined for all ##x in RR##.

Its domain will thus be ##(-oo, + oo)##.

The same can be said for its range. Your function can take any avalue of ##x## and produce any value of ##y in RR##, so its range will be ##(-oo, + oo)##.

graph{2x-1 [-10, 10, -5, 5]}