Question

if the ppints A(3,5) and B(1,4) lies on the garph of line ax +by =7 then find the value of a?

Answer 1

put points in eqn of line to get 2 eqns:
$3a + 5b = 7$

$a + 4b = 7$
$solve \: the \: above \: eqns \: to \: get \: a \: and \: b$