The charge of electricity for the first 20 units is Rs. 80. If Rs. 7.30 per unit is charged for the units 21 to 30, what is the charge of 27 units of electricity consumed in a household

The cost of 27 units of electricity will be Rs. 131.10

Step-by-step explanation:

Given that:

Cost of first 20 units = Rs. 80

Cost of per unit after 20 units = Rs. 7.30

Units consumed in a household = 27 units

Bill of first 20 will be Rs. 80 and 7 units will be charged on the rate of 7.30

Cost of 7 units = 7*7.30 = Rs. 51.10

Cost of 27 units = Rs. 80 + 51.10 = Rs. 131.10

Hence,

The cost of 27 units of electricity will be Rs. 131.10

option 2 is correct.

step-by-step explanation:

we are given two inequality equation

x+y> 5 and -3x+2y< -2

first we draw the graph of both function using t-table method

equation: x+y> 5

for x=0, y=5

for x=-5, y=0

table:

x   :   0     5

y   :   5     0

test point (0,0) , 0> 5

false

equation: -3x+2y< -2

for x=0, y=-1

for x=2, y=4

table:

x   :   0     2

y   : -1       4

test point (0,0) , 0< -2

true

now we draw the graph. see the attachment for graph.

common region would be solution set.

option 2 is correct.

step-by-step explanation:

let

we know that

the y-intercept is the y-coordinate of the point when the value of x is equal to zero

so

the y-coordinate of the point a is the y-intercept

the answer part a) is

the value of y-intercept is

part b) find the slope m

we know that

the value of the slope is equal to

substitute the values

therefore

the answer part b) is

the value of the slope is equal to

the general answer is

the slope is

the value of y-intercept is