13. If x= -1, y = 3 is a solution of the equation 5 x + ay = 4, then the value of a is:
(a)3
(b) 4
(c) 5
d) 9
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Answer:
HELLO!!
ANSWER IS (a) 3
x = - 1
y = 3
a = ?
5x + ay = 4
now put values
5(-1) + a(3) = 4
(-5) + 3a = 4
now,
3a = 4 + 5
3a = 9
a = 9/3
by cutting,
a = 3/1
a = 3
I HOPE THIS ANSWER IS HELPFUL FOR YOU
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