Question

3 pens and 2 erasers cost $5 three pens and three erasers cost 5.7 dollar how much do 2 erasers cost​

Answer 1

Answer:

$ 1.4

Step-by-step explanation:

Let the cost of pen and eraser be ' x ' and ' y ' each respectively.

Then, 3 pens and 2 erasers cost $5 will be written as

3x + 2y = 5 ........... eq 1

And 3 pens and 3 erasers cost 5.7 dollar will be

3x + 3y = 5.7 ........... eq 2

eq 2 - eq 1

3x + 3y = 5.7

-3x - 2y=-5

y = 0.7

From the above each eraser cost 0.7 dollars

.°. Cost of 2 dollars = 2 × 0.7 = 1.4

Answer 2

Answer:

1.4

Step-by-step explanation:

let the cost of pen and eraser be x and y

3 pens , 2 erasers cost = $5

3x + 2y = 5 equation 1

3 pens 3 erasers cost = $5.7

3x + 3y = 5.7. equation 2

equation 2 - equation 1

3x + 3y = 5.7

-3x - 2y = -5

y = .7

cost of 2 erasers will be = 0.7 or .7

= .7 * 2

= 1.4 answer

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