D=20-1.95c how would i work this out correctly

Umm is D represented by a number?

if it was, you would take D=20-1.95c subtract 20 from both sides, so you can isolate your variable, c

then divide both sides by -1.95 and you get

( D - 20 ) ÷ -1.95 = c

The point (5, 10) will work for the rule y=x+5.y= 10 x= 510=5+510=10therefore the ordered pair (5, 10) works for the rule