Question

if πx+3y=25, write y in terms of x and also find the two solutions of this equation.

Answer 1

π x + 3 y = 25
So    3 y = πx - 25
         y =  π/3 * x - 25/3

There is only one solution in terms of algebraic solution. 
We can find the value of y at two different values of x.

For x = 0,     y = π/3 * 0 - 25/3 = -25/3
for  x = 7/22,    y = 22/(7*3)  * 7/22 - 25/3  = 1/3  - 25/3 = - 8

Answer 2

πx+3y = 25
y = (25- πx)/3
When x =0 y= 25/3
so (0,8.33)
when y=0 x will be=7.96
(7.96,0)
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y=(25-πx)/3
(0,8.33) and (7.96,0)
are the solution