Question

evaluate the expression when $a = 6$ and $y = -3$ . $a - 4y$

Explanation:

Step1: Substitute given values

Substitute $a=6$, $y=-3$ into $a-4y$:
$6 - 4\times(-3)$

Step2: Calculate the multiplication

Compute $4\times(-3)$ first:
$6 - (-12)$

Step3: Simplify the expression

Rewrite subtraction of negative as addition:
$6 + 12$

Step4: Compute final sum

Add the two numbers:
$18$

Answer:

18