We have to solve the equation <em>for a </em>- in other words, we have to find a in terms of d and j. Another way to think about this is that we need a by itself on one side, equal to the other two values in some sort of relationship.
So, how can we accomplish this? Well, currently a is being divided by d, so we should probably multiply both sides by d to get that d away from a. The process is shown below:
And look at that! We've solved for a in terms of the other two values. If you need any more help or everything I just did was confusing or overwhelming, let me know so I can clarify. :)
The inverse of division is multiplication so to get rid of the d we multiply a/d by d but whatever we do to one side we must do to the other so we multiply both sides by d
They charge $30 per month as a base so that is y They also charge $0.25 per text message, this is x
so $0.25x+$30y=$59.50 first subtract 30 from both sides to get x alone $0.25x=$29.50 To find amount of text messages sent, we have to divide $29.50/$.25 29.50/.25=118 This person sent 118 text messages
