Lx-y + 1L + (y + 5) = 0, xy = how much

lx-y+1l+(y+5)=0
So X-Y + 1 = 0, y + 5 = 0
So y = - 5
x=y-1=-6
So xy = 30

RELATED INFORMATIONS

1. Given x + y = 2, xy = 1, find the value of (y + 1 / x + 1) + (x + 1 / y + 1),
2. Given LX + 4L + lx-y + 6L = 0, find the value of x square Y - [2x square Y - (3xy XY Square) - 3x square]
3. Given that the 2m + 6th power of a is 9, the 3rd power of a is the m power of 1 / 3 * a, find the m power of the m power of the algebraic formula 5A - the m power of a - (- 3 * a) + the m power of 2A
4. Ask for advice, today The N-1 power of Y minus the square of Y multiplied by the N-2 power of Y minus the 4 power of Y - the N + 1 power of Y multiplied by y =?
5. Urgent. It must be done today Figure 8 shows the charging standard of a highway toll station for passing vehicles. (large vehicle 30 yuan / vehicle, medium vehicle 15 yuan / vehicle, small vehicle 10 yuan / vehicle) one day, the ratio of the number of large vehicles and medium vehicles passing through the toll station is 5:6, the ratio of the number of medium vehicles and small vehicles is 4:11, and the total toll of small vehicles is 270 yuan more than that of large vehicles (1) How many large cars, medium cars and small cars will pass through the toll station on this day? (2) How much is the total charge for this day? Party A and Party B worked together to clear the snow on the 400 meter circular runway. They both cleaned the snow from the same place. At first, party a cleaned the snow one third faster than Party B. later, Party B used 10 minutes to adjust the tools and went back to clean it, but the work efficiency was twice as high as before, How many minutes did B work after changing tools? We need a formula
6. Let's know the square of X + xy = 3, the square of XY + y = - 21. Find the square of X + 4xy + 3Y, the square of 2.2x-xy-3y
7. Ask for a math problem: if x + y = 3, xy = - 4, then the algebraic formula y ^ 3x-x ^ 3Y=_____ Thank you! Please answer as soon as possible
8. Given XY / (x + y) = 2, find (3x-5y + 3Y) / (- x + 3xy-y)
9. It is known that LXL is less than or equal to 1 and Lyl is less than or equal to 1. Let m = LX + YL + ly + 1L + l2y-x-4l, find the maximum and minimum of M
10. Given lx-4l + ly + 2L = 0, find the value of 2x Lyl
11. If lx-2l + ly + 1L = 0, then x=_____________ ,y=_____________
12. How to solve lx-4l + ly-1l = o?
13. (1) If lx-2l = 0, then what is the value of X? (2) if lx-2l + ly + 1L = 0, then what are the values of X and y?
14. When - 3 ＜ x ＜ y ＜ - 1, LX YL + ly + 1L is reduced I can't do it. I'm too low. Well, of course I'm too low =-=lll
15. Lx-3l is greater than or equal to l2x + 1L
16. x=2 lx-1l+lx-3l =
17. When - 1 is less than X and less than 3, the reduction is: LX + 1l-lx-3l; when - 1 is less than X and less than 3, the reduction is: 2lx + 1l-3lx-3l + l2x + 4L
18. Simplify LX + 1L + lx-3l
19. It is known that the squares of 5x|2a + 1|and 4x (B-3) are opposite to each other. What is the power of the algebraic formula A to the power of B + 2a to the power of 2007?
20. If a + B = 4AB, then the value of (2a AB + 2b) / 2Ab is?