Q. 44.1( 27 Votes )

# Solve the followi

(i)  4x + 3y = 48 eq.  2x - 3y = 4 eq.

Adding eq. and eq., we get

4x + 3y + 2x - 3y = 48 + 4

6x = 52 Using this in eq., we have  104 + 9y = 144

9y = 40 (ii)  x + 15y = 39

x = 39 - 15y eq.  4x + y = 38

Using eq., we have

4(39 - 15y) + y = 38

156 - 60y + y = 38

59y = 118

y = 2

Putting this value in eq.

x = 39 - 15(2)

x = 39 - 30

x = 9

(iii)  2y + 3x = 13xy eq.  5y - 4x = -2xy eq.

Multiplying eq. by 4 both side, and Multiplying eq. by 3 both side, we get

8y + 12x = 52xy eq.

15y - 12x = -6xy eq.

Adding eq. and eq.

8y + 12x + 15y - 12x = 52xy - 6xy

23y = 46xy

1 = 2x Putting this in eq.     Rate this question :

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