Question

9.If y=2x, then find the value of
y.
X
у
A
O
B
O
60
O
90
O
120
O
160​

Answer 1

Answer:

MATHS

If y=2x+c−4 is a normal to the parabola y

2

=4x , then find the value of c ?

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ANSWER

Given, the line y=2x+c−4⟶(1)

and the parabola, y

2

=4x

⇒y

2

=4⋅1⋅x

∴a=1

We know, y=mx+C is normal to the parabola y

2

=4ax, if C=−2am−am

3

⟶(2)

From equation (1), let C=c−4

and m=2

Putting these values in equation (2) we get,

c−4=−2⋅1⋅2−1⋅(2

3

)

⇒c−4=−4−8

⇒c=−8.

Answer 2

Answer:

y =2x

y/x = 2

y=2x or x= 2y