Find the equation of the line that goes through (2, 7) and is parallel to y=4. Write the equation in the form y=mx+b.
The line y=4 is parallel to the x-axis, and cuts the y-axis at y = 4. The gradient of this line is m = 0.
The equation of the wanted line iis thus y = mx + b, with m = 0.
i.e. y = b
The line y = b passes through the point (2,7) which point has a y-value of b = 7.
The equation of the wanted line is y = 7