# How do you write an equation of the line containing the given point (5,8) and parallel to x+8y=7?

Dec 27, 2016

Change the 7 to an unknown constant, C, substitute 5 for x, 8 for y, solve for C, and then write the equation with the new value of C.

#### Explanation:

Change the 7 to an unknown:

$x + 8 y = C$

substitute 5 for x and 8 for y:

$5 + 8 \left(8\right) = C$

$C = 69$

The new equation is:

$x + 8 y = 69$