It is known that the circumference of an isosceles triangle is 10cm, the waist length is xcm, and the base length is YCM. ① take the waist length x as the independent variable, write out the functional relationship between Y and X, and find the value range of the independent variable x; ② when y = 3, find the value of X;

Function relation: 2x + y = 10, when y = 3, x = 3.5

It is known that the circumference of isosceles triangle is 10 cm, the waist length is xcm, and the base length is YCM (1) Taking the waist length x as the independent variable, the functional relationship between Y and X is written, and the value range of the independent variable x is calculated; (2) Find the value of X when y = 3; (3) Draw a picture of the function

(1) ∵ the circumference of the isosceles triangle is 10cm, the waist length is xcm, and the bottom length is YCM,
∴2x+y=10，
∴y=10-2x（2.5＜x＜5）；
(2) When y = 3, 3 = 10-2x,
The solution is: x = 3.5;
(3) As shown in the figure:

The circumference of isosceles triangle is 10cm, the base edge is YCM and the waist length is xcm;

According to the relationship between perimeter and edge, perimeter = sum of edges
We have 10 = 2x + y, and their functional relationship is y = 10-2x
According to the relationship between the sum of the two sides is greater than that of the third side, there is 0

The circumference of the isosceles triangle ABC is 10cm, the length of base BC is YCM, and the length of AB is xcm (1) write the function analysis of Y and X (2) find the value range of independent variable x

（1）y=-2x+10
This is because the circumference of the triangle is 10, x + X + y = 10
(2) The sum of the two sides is greater than the third side and the side length is greater than 0
X>0
-2x+10=y>0
x+x>y=-2x+10
obtain
2x10
Two point five

The analytic formula and definition domain of isosceles triangle with circumference of 15 cm and base length B varying with waist length a It's y= Is the domain of Y

If the length of the bottom edge changes with the waist, the length of the bottom edge is a Y-strain
B+2A=15
2A is greater than B (two sides of the triangle are greater than the third side)
therefore
If 2b is less than 15, B is less than 7.5, then 0 is less than B is less than 7.5
therefore
B = 15-2a (0 less than B less than 7.5)
If the range of a is required, 2a is greater than B and 4a is greater than 153.75 and less than a is less than 7.5)
Hope to help you!

It is known that the circumference of isosceles triangle is 80, the waist length is x, and the base length is y. The definition domain of the analytic formula of y about X is given Please write the process. I know that 0 is less than X and less than 40. Well, I don't know how to calculate it. Why is the sum of the two sides greater than the third I'm wrong. It should be 20 less than x less than 40, 2x greater than y, and the sum of both sides is greater than the third side

There are two equations: 2x + y = 80 and 2x > y. the area enclosed by two lines is drawn on the coordinate graph, and the range of X in the area is 0

The waist length of an isosceles triangle with circumference a is x and the base length is y. The analytic formula of the function between Y and X is_________ (write down the definition field)

2x+y=a
y=a-2x
The analytic formula of the function between Y and X is y = a-2x
a／4＜x＜a／2

Let the waist length of an isosceles triangle be x, the base length y and the circumference 12, then the analytic formula of Y function about X is defined as the domain of definition

2x+y=12
y=12-2x
12-2x＞0
0＜x＜6
2x＞y=12-2x
4x＞12
x＞3
∴3＜x＜6
y=12-2x (3＜x＜6)

If the circumference of an isosceles triangle is 20, and the base length y is a function of waist length x, then what is its interpretation and definition domain? Is the definition domain 5 < x < 10 or 0 < x < 10?

Analytical formula: y = 20-2x
Domain: 55)

Given that the circumference of an isosceles triangle is 8, find the function analytic formula of the base edge y with respect to the waist length X

On the one hand, according to the calculation formula of triangle perimeter:
2X + y = 8, so y = 8-2x
On the other hand, if three segments of length x, x, Y form a triangle,
So y ＜ 2x ＜ 8,2 ＜ x ＜ 4
Therefore, the analytic formula of the function of the bottom edge y with respect to the waist length x is y = 8 - 2x (2 < x < 4)