Find the nonpermissible replacement for y in this expression y-7/y+9

y ≠ - 9

Step-by-step explanation:

the denominator of the expression cannot equal zero as this would make the expression undefined. Equating the denominator to zero and solving gives the value that y cannot be

solve y + 9 = 0 ⇒ y = - 9 ← not permissable

according to the triangle sum theorem, all the angles in a triangle must add up to 180 degrees. if we know one angle is already 90, we do 180-90=90. the other 2 angles must add up to 90, exactly.

step-by-step explanation: