Answer:x=-10
Step-by-step explanation: We need to find the slope of the line to find equation.
slope of line x=3 is infinity.
equation of line parallel to x=3 will have same slope.
point given=(-10,3)
equation of line: (y-y1)=slope(x-x1)
= (y-3)=∞(x+10)
= (y-3)/∞=x+10
=0=x+10
=x=-10