Question

Q1. Two sandwiches and a juice cost $3.40. Four sandwiches and three juices cost $ 7.20. What is the cost of a juice? Solve by using substitution method

Answer 1

Answer:

x to the power x from first principles

Answer 2

Answer:

Step-by-step explanation:

Let the price of sandwiches be $x

Then the price of juice will be $y

2x+y = 3.4 --equation(1)

4x+3y = 7.2--equation(2)

From equation(1):

2x=3.4-y

x=3.4-y/2 --equation(3)

Substitute the value of x in equation(2)

4(3.4-y/2)

As 2 is in the denominator, 4 will be cross cancelled and 2 will remain. So,

6.8-2y+3y=7.2

6.8+y=7.2

y=7.2-6.8

y=0.4

So, the price of a juice is $0.4