To solve an equation using substitution - the equations are y=6x-11
-2x-3y= -7

So we see we got y=6x-11
sub 6x-11 for y int other eqution

-2x-3(6x-11)=-7
expand/distribute
-2x-18x+33=-7
-20x+33=-7
minus 33 both sides
-20x=-40
divide both sides by -20
x=2

sub back

y=6x-11
y=6(2)-11
y=12-11
y=1

x=2
y=1
(x,y)
(2,1)

Use a calculator basically