A poster is regularly priced at $19.98 is on sale for 40% off. What is the sale price?
1 answer:
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Answer:
m = - 1/4
Step-by-step explanation:
When two line is perpendicular to each other the product of them is - 1
So let the other line be B
Gradient of B = t
Gradient of A = 4
therefore m = - 1/4