If a,b,c are in A.P. find the value of: `||2y+4, 5y+7, 8y+a],[3y+5, 6y+8, 9y+b],[4y+6, 7y+9, 10y+c]] `

det[[ If a,b,c are in A.P,find value of ,2y+4,5y+7,8y+a3y+5,6y+8,9y+b4y+6,7y+9,10y+c]]

If 3x+5y =9 and 5x+3y=7, then find the value of x+y.

Find the value fo x:y, if (7x - 15y)/(4x + 6y) = (5)/(6).

Find the value of x:y, if (8x-10y)/(3x+4y) = (4)/(5) .

If y = sin px and y_n is the nth derivative of y , then find the value of |(y, y1, y2), (y3, y4, y5), (y6, y7, y8)|

If x, y , z are in A.P., then the value of the det (A) is , where A = [(4,5,6,x),(5,6,7,y),(6,7,8,z),(x,y,z,0)]