If the monthy cost for 23 HCF is $48.31 , what is the monthly cost for 18 HCF?
1 answer:
<u>Find the equation of the graph:</u>
General Equation : y = mx + b
.
Given that the gradient is 1.45
<u>Sub m = 1.45:</u>
y = 1.45x + b
.
<u>Find b:</u>
Given that x = 23, y = 48.31:
48.31 = 1.45(23) + b
b = 14.96
.
<u>Equation of the graph:</u>
y = 1.45x + 14.96
.
<u>When x = 18:</u>
y = 1.45(18) + 14.96 = $41.06
.
Answer: $41.06
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