In a city, electricity charges are calculated as follows: A fixed charge of $20 plus 30 cents per unit of electricity used. Taking
Question
In a city, electricity charges are calculated as follows:
A fixed charge of $20 plus 30 cents per unit of electricity used.
Taking 2 cm to represent 50 units on the horizontal axis and 2 cm to represent $20 on
the vertical axis, draw a graph to show the charges up to a maximum of 400 units.
From your graph, estimate
(a) the cost of using the following units of electricity:
(i) 110 (ii) 235 (iii) 79
(b) the number of units of electricity used if the bill is:
(i) $47 (ii) $66.50 (iii) $95
Pls answer ASAP
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2022-02-15T06:35:42+00:00
2022-02-15T06:35:42+00:00 1 Answer
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Answer:
Step-by-step explanation:
fixed charge of $ 20 + 0.30 per unit
y = 0.30x + 20….where x = # of units and y = total cost
using 110 units.. using 235 units using 79 units
y = 0.30(110) + 20 y = 0.30(235) + 20 y = 0.30(79) + 20
y = 33 + 20 y = 70.50 + 20 y = 23.70 + 20
y = $ 53 <=== y = $90.50 <=== y = $43.70 <==
as far as graphing purposes…
ur x axis (the one going across) is gonna be ur units and ur y axis (the one going up and down) is gonna be the total money
y = 0.30x + 20
u have a slope of 0.3
ur y int is (0,20)…..ur x int is (-200/3,0)