Question

In the following triangle ABC, ZB = 70°, ZBDE = 110°, BC = 5 cm , AE 3 cm and CE = 3 cm. Then the length of DE is​

Answer 1

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Answer

2x−3y=13...(1)

7x−2y=20....(2)

Let us use the elimination method to the given system of equations.

Multiply (1) by 2 and (2) by 3. And subtract both the equations.

−17x=−344x−6y=2621x−6y=60−+−

x=−14−34=+2

Substitute the value of x in equation (1), we have

y=−3

Hence x=2 and y=−3