In the equation shown below, a and b are unknown constants:
3ax + 4y = –2 and 2x + by = 14 If (–3, 4) is the solution of the given equations, find the value
of ab.
(a) 10 (b) 6 (c) 12 (d) 15
Answers
Answered by
7
Answer:
On substituting value of y=3 in second equation, we getax 2+b=3
⇒ax 2+b−3=0⇒ax 2= -3⇒x 2
=a=3-b
Since x 2
is positive quantity, therefore just a=2 and b=2 satisfies this.
Hence, option A is correct.
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Answered by
4
Answer:
On substituting value of y=3 in second equation, we get
ax
2
+b=3
⇒ax
2
+b−3=0
⇒ax
2
=3−b
⇒x
2
=
a
3−b
Since x
2
is positive quantity, therefore just a=2 and b=2 satisfies this.
hope it helps you!!
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