Systems+of+Equations

HOW TO: ...solve systems of equations by graphing [|example 1] Step 1.) Get all equations in slope-intercept form Step 2.) Graph each line Step 3.) Find the coordinate point where the graphs intersect. That is the solution!!!!

...solve systems of equations by substitution [|example 2] Step 1.) Isolate one variable in one of given equations Step 2.) Plug in equivalent expression in place of isolated variable in other equations Step 3.) Solve for remaining variable Step 4.) Go back and solve for previously isolated variable!

...solve systems of equations by linear combination [see a solved example [|here]] [|example 3] Step 1.) Multiply one or both given equations by a constant to get x coefficients to be equal Step 2.) Subtract whole second equation from whole first equation, cancelling x variables Step 3.) Solve for x Step 4.) Go back and solve for y