Question

PLEASE HELP :(

What is the equation of the line whose y-intercept is 3 and slope is 1?



A. y = x - 3


B. y = x + 3


C. y = 3x + 1

Answer 1

b

Answer 2

y = mx + c

Where m is the gradient and c is the y intercept .

Therefore y = x + 3

Answer 3

y = 2x + 6 has slope 2, therefore any line perpendicular to it will have slope -1/2 (the inverse reciprocal). The point (0,3) lies on the y-axis and is therefore the desired line's y-intercept. Since you need the equation in slope-intercept form, you've just got to throw the numbers into the equation.

y = mx + b
m = -1/2
b = 3

Therefore, DRUM ROLL PLEASE,
y = (-1/2)x + 3

Hope this helped!