When we're asked to solve a system of linear equations for x and y, we're really being asked to find the (x, y) point where these lines meet. Do they meet at (1, 1)? Pittsburgh? The fourth moon of...

Doesn't the word 'substitute' conjure up some sort of image of a teacher with pointy eyeglasses and a ruler?Hmm…disregard that, we're talking the substitution method, not substitute teacher. But...

This method for solving systems of equations goes by many names: the addition method, elimination method, or solving by "linear combination." Doesn't that sound like fun?It's not that bad, though....

Sorry, but life isn't always fair, and we have to deal with inequalities—even in math. Now we're going to cover how we deal with systems of linear inequalities. Yes, we know it's not fair. Are...

The x and y variables of a system of linear equations match up with the x- and y-axes on a graph. There are two variables for two dimensions. When we add in a third variable, z, that means we trave...

Three equations. Three unknown variables. If they aren't found in time, the whole world's supply of Silly Putty will go up in flames. Only one person can find them in time—and she just called in...