# Thread: Linear Equation DS (OG 12th)

1. Good post? |

## Linear Equation DS (OG 12th)

In the xy-plane, the line with equation ax + by +c = 0 where a*b*c (not = 0), has slope 2/3. What is the value of b?

1) a =4

2) c = -6

SPOILER: A

Please explain!! How do we deal with the second statement?

2. Good post? |
Originally Posted by canadian phd
In the xy-plane, the line with equation ax + by +c = 0 where a*b*c (not = 0), has slope 2/3. What is the value of b?

1) a =4

2) c = -6

SPOILER: A

Please explain!! How do we deal with the second statement?
IMO A

Slope of St line m = a/b

State1: m and a is given, we can find b.
State2: c and m is given. we can not find a or b.

3. Good post? |
When equation of a straight line is ax +by +c =0

Slope of the above line = m = - a/b

Slope as given = 2/3

A) a=4 , so using this we get
=> -4/b=2/3 from this we can get value of b.

B) c=-6 ..from this we cant calculate anything.

Thus, only A used alone will give the answer.

Hence A

Thanks and regards,
Vivek

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