xy - 10x + 6y - 60 = x(y - 10) + 6(y - 10) = (y - 10)(x + 6)
x(y - 10) + 6y
5x + 8xy + 10x + 3xy = 15x + 11xycombine like terms (the x's and the xy's)
14
-1
let this integer be (xy) (xy) = 10x + y 10x+y = 2.x.y 10x + y - 2xy = 0 2x.(5-y) +y= 0 x= y / 2(y-5) when the integer provides this condition, it is equal to twice the product of its digits. And there is such only one integer. 36
10x-1=35 is equal to 10x-1+1=35+1, or 10x=36 10x=36 is equal to 10x/10=36/10, or x=3.6
10x=80 divide each side by 10 to get x by itself 10/10x=1x 80/10=8 x=8
x/10x = 1/10 or 0.1
24
The derivative of 10x with respect to x is 10 and 25y with respect to y is 25. If it is 10x25y, then use the chain rule. 10x 25y = 10*25y + 10x*25y' = 250y + 250xy'
x = first number y = 2nd number x+ y = -10 y = -10-x also, xy = 9 x(-10-x) = 9 -10x -x2 -9 = 0 x2 +10x + 9 = 0 (x+1)(x+9) = 0 X = -1 and substitute find y = -9 Ans: -1, -9