Linear combinations

XxcatherinexX

New member
I've tried and tried but I can't exactly remember where to start with this equation
3x +7y = -1
7y = -6x

Loren

Senior Member
You say "this equation". Looks to me like you have two equations. The place to start is to decide what you are after with what you have. Are you trying to solve for x, for y or for both? Possibly, you want to graph one or both of them. Maybe you are trying to restate one or both as a function of x or as a function of y. Just what are you after? When responding, please show us what you have done so far.

masters

Full Member
Use Linear Combination to Solve Systems of Equations and Inequalities
1st: Rearrange the equations so terms line up as: Ax + By = C
2nd: Multiply none, or one, or both equations by constant(s)
so that the coefficients of one of the variables are opposites.
3rd: Add the two equations together to eliminate one of the variables.
4th: Solve.
5th: Use one of the equations and this value to solve for the other variable.
6th: State the solution and include values for both variables.