## 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.
(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​

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3 months 2022-02-15T06:35:42+00:00 1 Answer 0 views 0

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)