please help me solve this problem
9 - 8y > 5 + 7y + 2
I've tried and got the following:
9 - 7 > 7y + 8y CORRECT!
2 > 15y CORRECT!
2/15 > y CORRECT!
That's perfectly correct! (But don't put equal signs
between steps!)
---------------------
-8y - 7y > 7 - 9 CORRECT
-15y > -2 CORRECT
y < -2/15 INCORRECT!!!!!!
That last step is wrong. You were
correct to reverse the inequality
symbol when you divided through by
-15, but when you divided the
right side, -2, by -15 you should
have gotten +2/15, not -2/15, so
make that last step
y < 2/15
and it will be correct. You do
realize that this and
2/15 > y
are equivalent statements, don't you?
Edwin
