a+b=5 ,3a+2b=20 (3a+b)=?
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a+b=5 ---------(1)
Multiplying 3 both the sides
3a+3b = 15
=>3a+2b = 15-b
Since, 3a+2b = 20
Therefore, 15-b = 20
=> b= 15-20 = -5
From (1)
a+(-5) = 5
=> a = 5+5=10
For, 3a+b
= 3*10 +(-5)
= 30-5
= 25
Hope it helps. :)
Mark as brainlist plz
Multiplying 3 both the sides
3a+3b = 15
=>3a+2b = 15-b
Since, 3a+2b = 20
Therefore, 15-b = 20
=> b= 15-20 = -5
From (1)
a+(-5) = 5
=> a = 5+5=10
For, 3a+b
= 3*10 +(-5)
= 30-5
= 25
Hope it helps. :)
Mark as brainlist plz
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