Evaluate the expression when a=5 and y=-6 . a-4y square square

Substitute $a=5$ and $y=-6$ into the expression:<br />$a-4y = 5 - 4(-6)$<br />Calculate:<br />$5 - 4(-6) = 5 + 24 = 29$<br />Therefore, the value of the expression is 29.