Question 946454
I'm assuming that A stays fixed and that the new B moves since you didn't specify.
To get from A to B you move {{{-3-5=-8}}} units in {{{x}}} and {{{7-10=-3}}} units in {{{y}}}.
If you multiply that by {{{5}}} you would get {{{-40}}} units in {{{x}}} and {{{-15}}} units in {{{y}}}.
Starting at A,
({{{5}}},{{{10}}})+({{{-40}}},{{{-15}}})=({{{-35}}},{{{-5}}})
So the new B would be ({{{-35}}},{{{-5}}}).