I never understood the system of inequalities and using a graph, help?
Plot the graph as if there were an equal sign instead of > or < ; then use logic to decide where (which side of the line) the possible solutions exist. Example: for x>2, Plot an x=2 vertial line. The solutions are on the right side of that line. The x<2 area could be "shaded" somehow to show that solutions cannot exist there.
When dealing with more than one inequality, plot all of the lines in this way to decide what (x,y) combinations are allowed
C/2 + C/2= 1/2
Add the two C/2's together and see what you get.
12.4=5*b/2
5-5
When you have an equation like C/2 + C/2 = 1/2, you can start by adding the two C/2 terms together. Since they have the same denominator, you can add the numerators and keep the denominator the same. This gives you (C + C)/2 = 1/2. Simplifying, you get 2C/2 = 1/2 which further simplifies to C = 1/2.
For the equation 12.4 = 5*b/2, you can begin by multiplying both sides of the equation by 2 to eliminate the fraction. This gives you 2 * 12.4 = 5 * b, which simplifies to 24.8 = 5b. To solve for b, you can divide both sides of the equation by 5. So, b = 24.8/5 = 4.96.
Finally, when you have 5 - 5, the result is 0.