



 
Hi Vincent. Vincent wrote back: what I did is I see your trouble. When you work with equations, you have to "solve for" a variable. In this case, you want to solve for y. The way you do this is by performing the same operation on both sides of the equation so that you can get y by itself on the left hand side. Let's do this for the first line's equation now. I'll show you all the steps: Now here is how you do this for the second line: You'll want to practice working with equations with just one variable (usually we practice with equations with just x in them) so you know how to do this before working with two or more variables and two or more equations at once. You can find many of these kinds of problems on our web site by typing solve into the search page. Now the slopes of the two lines are apparent, because they are the numbers (and signs) in front of the x variable when the line is in the y = mx + b form. So the first line's slope is 1/8 and the second line's slope is 8. The negative reciprocal of 8 is 1/8 so these two lines are parallel. Stephen La Rocque. >  


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