Respuesta :

Answer:

AB = 5

Step-by-step explanation:

Since the triangle is isosceles then the legs are congruent, that is

BC = BA, substitute values

5x - 10 = 3x - 4 ( subtract 3x from both sides )

2x - 10 = - 4 ( add 10 to both sides )

2x = 6 ( divide both sides by 2 )

x = 3

Thus

AB = 3x - 4 = 3(3) - 4 = 9 - 4 = 5

S1NGH

Answer:

AB = 5

Step-by-step explanation:

Because it is an isosceles triangle, we can say that AB equals BC, so we can form an equation.

AB = BC

3x - 4 = 5x - 10

→ Minus 5x from both sides to get the 'x' on one side

-2x - 4 = -10

→ Add  -4 to both sides to isolate -2x

-2x = -6

→ Divide both sides by -2 to isolate x

x = 3

Now we know that x = 3, we can put it in to the length of AB

3 × 3 - 4 = 9 - 4 = 5

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