Answer:
[tex]y = 164[/tex]
Step-by-step explanation:
Given
[tex]y = 8x + 4[/tex]
Where
[tex]x = number\ of\ comic\ books[/tex]
[tex]y = total\ cost[/tex]
Required
Find y when x = 20
To do this, we simply substitute 20 for x in [tex]y = 8x + 4[/tex]
[tex]y = 8*20 + 4[/tex]
[tex]y = 160 + 4[/tex]
[tex]y = 164[/tex]
Hence, 20 comic books cost 164
