Use substitution to determine which of the following points is a solution to the standard form equation below. 5x-2y=10
a. (-1,5)
b. (1,5)
c. (0,-5)
d. (0,5)

How do i do this activity, is appreciated

Two customers went to a post office. first customer paid $12 for 14 and 5 envelopes the second paid 24.80 for 10 postcards and 15 envelopes. what is cost of each envelope?

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