Hello this is the question I am stuck on:

The line joining (a,6) to (-3,5) has a gradient of 1. Determine the value of a.

This this the process i used:

1= (5-a)/(-3-6) then I rearanged it and got that a equals -4... But that is not the correct answer. How do I correctly work out the value of a?

2. Originally Posted by Paulo1913
Hello this is the question I am stuck on:

The line joining (a,6) to (-3,5) has a gradient of 1. Determine the value of a.

This this the process i used:

1= (5-a)/(-3-6) then I rearanged it and got that a equals -4... But that is not the correct answer. How do I correctly work out the value of a?
$1 = \frac{5 - 6}{-3 - a} .....$

You've used the formula incorrectly (do you see your mistakes?).

3. Thanks.
How do I rearange that? because I simplify it to -1/(-3-a)=1 but I don't know what to do next

4. Originally Posted by mr fantastic
$1 = \frac{5 - 6}{-3 - a}$

[snip]
$\Rightarrow 1 = \frac{-1}{-3 - a} \Rightarrow 1 = \frac{1}{3 + a} \Rightarrow 1 = 3 + a .....$