Question

If the point (2a - 6,3a +15) lie on the X axis then a =​

Answer 1

Step-by-step explanation:

If the point (2a - 6,3a +15) lie on the X axis

then, 3a + 15 = 0

3a = -15

a = -5

Answer 2

The value of a = - 5

Given :

The point (2a - 6 , 3a + 15) lie on the x axis

To find :

The value of a

Solution :

Step 1 of 3 :

Write down the given point

Here the given point is (2a - 6 , 3a + 15)

Step 2 of 3 :

Write down the abscissa and ordinate

For the point (2a - 6 , 3a + 15)

Abscissa = 2a - 6

Ordinate = 3a + 15

Step 3 of 3 :

Find the value of a

Since the point (2a - 6 , 3a + 15) lie on the x axis

Ordinate = 0

$\displaystyle \sf{ \implies 3a + 15 = 0}$

$\displaystyle \sf{ \implies 3a = - 15 }$

$\displaystyle \sf{ \implies a = - \frac{15}{3} }$

$\displaystyle \sf{ \implies a = - 5 }$

Hence the required value of a = - 5