Tea costs $x a packets and coffee $y a packet. Five packets of tea and seven of coffee cost $39.40 while three packets of tea and five of coffee cost $26.20. Work out the cost of a packet of tea

$4.53

Step-by-step explanation:

Let us represent

The cost of a

Packet of tea = x

Packet of coffee = y

Five packets of tea and seven of coffee cost $39.40

5x + 7y = 39.40Equation 1

Three packets of tea and five of coffee cost $26.20.

3x + 5y = 26.20Equation 2

Combining both Equations

5x + 7y = 39.40Equation 1

3x + 5y = 26.20Equation 2

Multiply Equation 1 by 5 and Equation 2 by 7 to eliminate y

25x + 35y = 197 Equation 3

21x + 35y = 183.4Equation 4

Subtract Equation 4 from 3

3x = 13.6

x = 13.6/3

x = $4.53

Therefore, the cost of a packet of tea is $4.53

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)

im guessing (23,14). hope this : )