I decided to put my new algebra skills into practice recently. But it didn't work!

I obtained a price list the other day for some products we are looking to buy. Their price decreases the more you buy.

between 50-99 qty their price is £8.76

between 100-199 qty their price is £6.57

There will become a point where it's the same price to buy x amount in the lower price bracket than it would to buy the same money's worth in the higher price bracket. I.e, you'd get more for the same price.

I tried using linear equations for both prices and solving them simultaneously to find a point of intersection where both equations were equal. But the lines only intersect at 0.

I know it is possible to do this. I'm just stumbling somewhere. Bit of help would be good. I am thinking I may need to add a value to the constant of the linear equations, but am unsure where to start.