What is an equation for the line that passes through points (-1, -4) and (1, 4)?

Question

please help!

Answer 1

slope-intercept from line equation is y = mx + b, where m is slope and b is y-intercept. 

Find the slope using the formula m = (y2 - y1) / (x2- x1) = difference of y-coordinates/ difference of x-coordinates 

m = (4 - (-4)) / (1 - (-1)) 

m = 8 / 2 = 4 

The line equation is y = 4x + b. 

Find the y-intercept by substituting any coordinate values say (-1, -4) in the equation 

-4 = 4 * -1 + b 

b = 0 

The line equation is y = 4x