![](data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" viewBox="0 0 72 71" width="72"></svg>)
If y-x-2 = 0, then 3x-1 should be () A. 3y-1B. 3y+1C. 3y-7D. 3y+7
Add (- y + 2) on both sides of the equation y-x-2 = 0 to get - x = - y + 2, multiply - 3 on both sides of the equation to get 3x = 3y-6, subtract 1 on both sides of the equation to get 3x-1 = 3y-7
If x + 3Y = 3x + 2Y = 7, then x + y = what?
x+3y=7
3x+2y=7
x=1
y=2
x+y=3
If x + 3Y = 3x + y = - 7, then x + y=
Good answer, plus 10 points!
X + 3Y = 3x + y = - 7 becomes:
x+3y=-7
3x+y=-7
By adding the above two equations, we can get the following results:
4（x+y）=-14
So: x + y = - 7 / 2
A = 3x + y, B = 3x-3y, try to compare the size of a and B
A-B=3x+y-3x+3y=4y
y> 0, a ≥ B
y
If x is greater than y, compare 2 minus 3x with 2 minus 3Y
x>y
-3x
If - 3x + 1 ＞ - 3Y + 1, what is the size relationship between X and y
-3x+1＞-3Y+1
-3x＞-3Y
3x+3y-3x＞3x+3y-3Y
3y>3x
y>x
First positive solution
3x-1 open cube and 3Y + 4 open cube guard the opposite number, what is x + y equal to
Open cubes are opposite to each other
So 3x-1 and 3Y + 4 are opposite numbers
So 3x-1 + 3Y + 4 = 0
3x+3y=-3
x+y=-1
If x2-y2 = 48, x + y = 6, then 3x-3y=______ ．
If x2-y2 = (x + y) (X-Y) = 48, ∵ x + y = 6, ∵ X-Y = 8, then 3x-3y = 3 (X-Y) = 3 × 8 = 24
If x is greater than or equal to 0, y is greater than or equal to 0, and X + 2 = 1, then 2x + 3Y squared
If x, y are greater than or equal to 0 and X + 2Y = 1, then the minimum value of the square of 2x + 3Y is
Don't paste other people's I don't understand
Hello!
x+2y=1
x = 1 - 2y
2x+3y²
= 2(1-2y)+3y²
= 3y² - 4y + 2
= 3(y² - 4/3 y) + 2
= 3 (y² - 4/3 y + 4/9 ) - 3*4/9 +2
= 3(y - 2/3)² + 2/3
x = 1 - 2y ≥ 0
∴ 0 ≤ y ≤ 1/2
The symmetry axis of quadratic function 3 (Y - 2 / 3) &# + 2 / 3 is y = 2 / 3
So 0 ≤ y ≤ 1 / 2 is monotonically decreasing
When y = 1 / 2, the minimum value is 3 / 4
If the square of x minus the square of X Y minus 3Y equals 0, find the ratio of X to y
Is it x2-xy-3y2 = 0? If it is, it can be multiplied by cross to get (x-2y) x (x + y) = 0, so x = 2Y or x = - y, so x is equal to 2 or - 1 than y
RELATED INFORMATIONS
- 1. Find the analytic expression of Y with respect to X by knowing x = 2y-2 divided by 1 + y When x = 0, - 1,3,..., the value of function y The value range of independent variable x Wrong, wrong... It's x = 2y-1 divided by 1 + y
- 2. The range of the function y = 1 / 2 of X-1 (x > 1) is?
- 3. Given the function f (x) = LG (3 ^ x + x-a), if x ∈ [2, + infinity], f (x) ≥ 0 is constant, then the value range of A
- 4. The angle between vectors a and B is 45 degrees, and the modulus of a is 1, | 2a-b | = √ 10, | B | =?
- 5. Finding the area of parallelogram with vector Given that the module of vector a is 4, the module of vector B is 3, and their angle is 30 degrees, find the area of the parallelogram with vectors a + 2B and a-3b as sides. Since the arrow can't be typed, please note that the letter in the title is vector The answer is 30, because I know how to calculate, but I can't,
- 6. As shown in the figure, in the triangle ABC, ab = 7, AC = 6, BC = 8, the straight line of line BC moves along the Ba direction at the speed of 2 units per second, and always keeps the same as the original line
- 7. If the vector Ba * (2 vector BC vector BA) = 0, then the shape of △ ABC is
- 8. As shown in the figure, ab ∥ DC, ad ∥ BC, be ⊥ AC in E, DF ⊥ AC in F, prove: be = DF
- 9. In the triangle ABC, CD is the middle line on the edge of AB, and Da = DB = DC Verification angle ACD = 90 degree
- 10. Given the module of vector a = 3, B = 4, C = 4, and the vector a + B + C is 0. Find AB + CB + AC
- 11. X minus 1 is a quarter of the difference between 2x and 1
- 12. What is the square of 12 plus the square of 4
- 13. 1.4 square meters = how many square decimeters
- 14. If the length of a rectangle is increased by 2 meters and the width by 5 meters, then the area will be increased by 60 square meters. At this time, it will just become a square?
- 15. A rectangular piece of land is 24 meters long and 512 meters wide. How many square meters is the area of this piece of land?
- 16. There is a rectangular lawn. If the length and width increase by 1 / 3, the area will increase by 6.3 square meters. How about the area of the rectangular lawn?
- 17. A rectangular reservoir, 6 meters long and 3 meters wide, is paved with floor tiles with an area of 9 square decimeters at the bottom of the reservoir. How many such floor tiles do you need?
- 18. How many guest rooms are there in a five-star hotel with a building area of 170000 square meters? I just want to ask about the general scope. Please let me know,
- 19. A cuboid tank is 10 meters long, 4 meters wide and 2 meters deep. How many liters of water can it hold at most? How many square meters does it cover?
- 20. Is one square meter equal to one meter into one meter?