Subtract the numbers.
10 - 8 = 2
Divide it to the smaller number:
2 / 8 = 0.25
Multiply by 100:
0.25 * 100 = 25%
Let x represent the number of DVDs and y represents the number of CDs.
DVDs are sold for 8$ and CDs are sold for 6$.
If you have 50$ to buy gift cards then the following inequality should be satisfied:
8*x+6*y<50
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slope formula: y2-y1/x2-x1