Hello, again. I have done all the 3 number 2 variable problems. However I am having immense problems with the 4 number 2 variable problems.
And I'm lost.
Am I doing it wrong?
Any tips for future problems like this?
Okay. You are getting a little confused here. Remeber that you have to bring the the like terms together. That is bring "d"s on one side and the "numbers" on the other side.
Basically, you need to get rid of that 13 on the left hand side and 3d on the right hand side. Lets do it step by step.
To get rid of 13 on the left side, add 13 to both sides of the equation (since the equation has -13 on the LHS, you are adding 13 on both sides. Had it been only 13, you would be subtracting)
now you need to get rid of the 3d on the right side. so subtract "3d" from both sides: