Question 204561
{{{y = 2x+5}}} For (8, ?) substitute x = 8.
{{{y = 2(8)+5}}}
{{{y = 21}}} so... (8, 21)
{{{y = 2x+5}}} For (-1, ?) substitute x = -1.
{{{y = 2(-1)+5}}}
{{{y = -2+5}}}
{{{y = 3}}} so...(-1, 3)
{{{y = 2x+5}}} Foe (?, -1) substitute y = -1 See if you can work this one yourself.
Good luck!