Question

What is the value of x in the equation 8x-2y=48, when y=4?.

Answer 1

$8x-2*4=48 \Rightarrow 8x-8=48 \Rightarrow 8x=56 \Rightarrow x=7$

Answer 2

8x-2y=48
y=4
8x-2×4=48
8x=48+8
8x=56
x=7