Are the lines y = –x – 4 and 5x + 5y = 20 perpendicular? explain.

yes; their slopes are equal.
yes; their slopes have product –1.
no; their slopes are not equal.
no; their slopes are not opposite reciprocals.

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step-by-step explanation:

this is the formula: v = the value of investment at the end of the time period

p = the principal amount (the initial amount invested)

r = the annual interest rate

n = the annual frequency of compounding (how many times a year interest is added)

t = the number of years the money is invested

^ means raise to the power of