Y would equal -2 this is because -1.5 would replace x. So it would be 2(-1.5)+1 and then you multiply those and get -3+1 which is -2
X would be 2.5 when Y equals 6 this is because you would replace 6 with Y in the equation. (6)=2x+1 you would then subtract 1 from each side which would give you 5=2x and then you would divide by 2 to get x alone which would give you 2.5=x
