Question

.. If is a solution of the equation 3x-5y=a, then value of a is
a. 19
b. -21
C.-9
d. -18​

Answer 1

It seems your question is incomplete

However, I assumed the value sof x and y to get and I have provided you all the solutions for x and y possible based on the options. There can be multiple solutions you can just put the values and find out.

OR you can post the new question with complete question

3x - 5y = a

If (x, y) is (8,1) then a = 3*8-5*1 = 24-5 = 19

If (x, y) is (3,6) then a = 3*3-5*6 = 9-30 = - 21

If (x, y) is (2,3) then a = 3*2-5*3 = 6-15 = - 9

If (x, y) is (-1,3) then a = 3*(-1)-5*3 = - 3-15 = - 18

There can be multiple solution based on the values of x and y for a.