You have made a substitution in order to solve a system of equations and now have an equation in one variable. Which of the following indicates that the original system represents a pair of parallel lines? Select one:

a.
x + 3 = x + 5

b.
x + 3 = 5

c.
2x + 3 = x + 5

d.
x + 3 = x + 3

Before simplifying, how many terms are there in the expression 2x - 5y + 3 + x?

Mary beth used the mapping rule to find the coordinates of a point that had been rotated 90° counterclockwise around the origin. examine the steps to determine whether she made an error. m (3, –6) is rotated 90° counterclockwise. (x, y) → (–y, x) 1. switch the x- and y-coordinates: (6, –3) 2. multiply the new x-coordinate by –1: (6(–1), –3) 3. simplify: (–6, –3) .

Aquantity with an initial value of 3900 decays exponentially at a rate of 35% every hour. what is the value of the quantity after 0.5 days, to the nearest hundredth?