Find such a coefficient a for the linear equation ax –y=4, so that the graph of the equation would pass through the point m (3, 5).

We have that
ax –y=4

if the graph of the equation would pass through the point M (3, 5)
then
for the point M (3, 5)
x=3
y=5
I substitute the values of x and y in the equation
ax –y=4> a*3-5=4> a*3=4+5> a=9/3
a=3

the answer is
a=3