Solve by substitution method 9x-10y =21,3x/2-5y/2=7/2
Answer (1)
1st Feb, 2025
Given:
9x - 15y = 21 (1)
3x/2 - 5y/2 = 7/2 (2)
Multiplying both sides of equation (2) with 6 we have
9x - 15y = 21
Or, 9x = 21 - 15y (3)
Substituting equation (3) in equation (1) we have
21 - 15y - 10y = 21
Or, -25y = 21 - 21
Or, -25y = 0
Or, y = 0
Plugging y = 0 in equation (3) we get
9x = 21
Or, x = 7/3
Verifying the answer
Putting x = 7/3 , y = 0 in (1)
9(7/3) - 10(0) = 21
Or, 21= 21
Similarly verified for (2) also
Hence verified.
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