if 5 x + y = 15 , 5 y + z = 25 and 2 z + x = 2 , what is the value of x ?
"explanation : 5 x + y = 15 – - - - - - - - i * 5 5 y + z = 25 – - - - - - - ii 2 z + x = 2 - - - - - - - - iii subtract ( i ) and ( ii ) 25 x + 5 y + 0 = 75 - 0 + 5 y + z = 25 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 25 x + 0 – z = 50 … . . . . . . . . . . iv multiply ( iv ) * 2 , we get 50 x – 2 z = 100 adding ( iii ) and ( iv ) we get , 50 x – 2 z = 100 + x + 2 z = 2 - - - - - - - - - - - - - - - - - - - - - - - - 51 x = 102 x = 2 the value of x = 2 answer : a"
multiply(2, power(subtract(15, multiply(divide(add(15, 25), add(5, const_2.0)), 5)), 5))