Reduce to simplest form -9/12 - (-7/4)=

Step-by-step explanation:

First we need to reduce then we add the similar fractions

In second step you can see that -7/4 become 7/4 the reason for that is the negative sign in front of parenthesis

When two numbers multiplied it gives out a positive number therefore - (-7/4) which is also can be written as -1 × -7/4 = 7/4.

its a straight line parallel to the time axis