Answer:
x = -3
Explanation:
Since, the line has x-intercept of -3,
⇒ line passes through (-3, 0),
We know that,
The Slope of a line passes through
and
is,

Slope of the line passes through (-3, 0) and (-3, 7),

That is, the line is parallel to y-axis.
Let the equation of the line,
x = a, where, a is any constant,
Since, it is passes through (-3,0),
⇒ -3 = a
Hence, the equation of the line would be,
