y = 2x + 7
the equation of a line in ' slope-intercept form ' is
y = mx + c ( m is the slope and c the y-intercept )
to calculate m use the ' gradient formula '
m = ( y₂ - y₁ ) / ( x₂ - x₁ )
with (x₁, y₁ ) = (0, 7 ) and (x₂, y₂ ) = (1, 9)
m = [tex]\frac{9-7}{1-0}[/tex] = 2
given the point (0, 7 ) then c = 7
y = 2x + 7 ← in slope-intercept form
