Question

Which is an equation of the line with slope –3 and passes through (2, –1)

a) 3x + y = 5

b) –3x + y = 5

c) y = 5x – 3

d) y = –3(x + 5)

Answer 1

using the formula:

y = mx +b

Using the given slope and coordinate points we get:

-1 = -3(2) + b

-1 = -6 + b

add 6 to each side

5 = b

y = -3x + 5

which is the same as:

3x + y = 5 ...answer choice a