color(red)("To find x and y, you need to solve these equations simultaneously:")
y=-2x-17 .........(1)
-x+11y=66 .........(2)
sub (1) into (2):
-x+11(-2x-17)=66
color(red)("Expand the brackets:")
-x-22x-187=66
color(red)("Group like terms:")
-23x-187=66
color(red)("Put all integers on the right:")
-23x=253
color(red)("Isolate x:")
therefore x=-11
color(red)("Now to find y:")
sub x=-11 into (1):
y=-2(-11)-17
color(red)("Expand brackets and simplify:")
y=22-17
therefore y=5
color(red)("Putting what we have found all together:")
therefore x=-11, y=5