A line with a slope of 4 passes through the point 2,1 what is the equation of this line ?

Answer 1

Another method would be to use the point-slope formula because we have a point and the slope.

Formula: y-y₁ = m ( x - x₁) , where m= 4 and (x,y) is (2, 1)

y - 1 = 4 ( x - 2)

y - 1 = 4x - 8

y= 4x - 7 <-- our equation

Answer 2

Put this in y= mx +b form

we have the slope(4) as well as a set of points for x and y so we have everything we need to solve for b

1= 4(2) + b

1 =8+b B=-7

so equation is y = 4x -7