Question

2÷ X + 5÷ y = 1 and 60 ÷ X + 40 ÷y = 19 find by cross multiplication method

Answer 1

ATQ

2/x+5/y=1 and

60/x+40/y=19

Let,1/x=a and 1/y=b

so,2a+5b=1 and

60a+40b=19

multiply equation 1 by 30

60a+150b=30

60a+40b=19

Apply elimination

so,110b=11 or

b=1/10 so,

a=1/4

now a=1/x so,

1/4=1/x or

x=4 and

b=1/y so,

1/y=1/10 or

y=10 Hope this helps you