kaixin13440
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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

Respuesta :

texaschic101

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)

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