Question 195854
We are trying to find equation of form y=ax+b, where a is slope, and b is intercept, which passes through points (x1, y1) = (45, 1300) and (x2, y2) = (50, 1365).
Slope a is {{{a = (y[2]-y[1])/(x[2]-x[1])}}}
{{{a =(1365-1300)/(50-45)}}}
{{{a =13}}}
Intercept is found from equation 
{{{a*x[1]+b = y[1]}}} 
{{{13*45 +b = 1300}}}
{{{b=1300-13*45}}}
{{{b = 715}}}

So the equation of that line is
{{{y= 13x + 715}}}


Now find the Basal value when w = 53.2
{{{y = 13 * 53.2 + 715}}}
{{{y = 691.6 + 715}}}
{{{y = 1406.6}}}