Question

Linear equations in two varables
Two pens and one eraser cost 35 pesos and 3 pencils and 4 erasers cost 65 pesos find the cost of pencil and eraser seperately

Answer 1

Let the pens cost =x and eraser cost =y

Then according to question

2x+y=35___(1)

3x+4y=65___(2)

Multipling 1) by 4

8x+4y=140

3x+4y=65

Now subtract both equation

So

5x=75

X=15

Putting value of x in)(1)

2×15+y=35

Y=5