1.

11x+15y+23=0,7x+2y-20=0 calculate the value of x and y ?

Answer»

11x + 15y = - 23....(1)7x + 2y = 20..........(2)

Multiply eq(1) by 7 and eq(2) by 11

77x + 105y = - 161.....(3)77x + 22y = 220.........(4)

Subtract eq(4) from eq(3)83y = - 381y = - 381/83

Put value of y in eq(2)7x + 2*(-381)/83 = 207x = 20 + 762/837x = (1660 + 762)/837x = (2422)/83x = 346/83



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