Find the equation of a line through a point with a given gradient.
\( \text{Which is the correct equation for gradient } 4 \text{ through } (1, -3)? \)
Select all correct options:
Substitute the point and gradient, then simplify to get y = mx + c.
Use point-slope form y - y1 = m(x - x1) and simplify to slope-intercept form.
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