Question

8th grade math please help

Answer 1

Answer:  $\bold{a)\quad E=\dfrac{1}{5}s}$

                b) 75

                c) $24

Step-by-step explanation:

the difference in the y-values (electricity) divided by the difference in the x-values (students) is the rate of change. $\dfrac{10}{50}=\large\boxed{\dfrac{1}{5}}$

Electricity = rate of change × students  ⇒   $E=\dfrac{1}{5}s$

b) Find s when E = 15  

   $15=\dfrac{1}{5}s\\\\\\(5)15=(5)\dfrac{1}{5}s\\\\\\\large\boxed{75 = s}$

c) Find E when s = 120

   $E=\dfrac{1}{5}\times 120\\\\\\E=\dfrac{120}{5}\\\\\\\large\boxed{E=24}$