The slope intercept form of equation is
Y = mx + b
where m = slope and b = intercept
Sean knows the slope to be 4
passes through the point 1 and -8
This implies that x = 1 and y =-8
slope = m = 4
(1, -8)
y - y1 = m(x - x1)
y - (-8) = 4(x - 1)
y + 8 = 4 * x - 4*1
y + 8 = 4x - 4
make y the subject of the formula
y = 4x - 4 - 8
y = 4x - 12
Since, y = mx + b
Therefore b = -12
The equation of the line is
y = 4x - 12
Intercept of the line is -2
The answer is y = 4x - 12 and -12
