Here's a fun, but trivial use of a system of two linear equations in two unknowns. Let's go back the the Superbowl. The 'line' on the Superbowl was 5 points in favor of the Panthers. read more
We need to take the y and plug back into any of the equations we have and typically the easiest thing to do is plug it into the equation that we’ve already solve for our variable. So if I take this y, plug it back into the equation I already solved for I end up with x is equal to 3 minus 2 times ½. 2 times ½ is 1, 3 minus 1 is 2. read more
"Linear" equations are equations with just a plain old variable like "x", rather than something more complicated like x 2, or x / y, or square roots, or other more-complicated expressions. Linear equations are the simplest equations that you'll deal with. read more