The sum of 9p and (-8q) is
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9p-8q is the answer.
Note :- Check if there is written q or p with 8, if p is there then ur answer will be p.
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If 3p = 4q and 9p = 8q -12, Find the value of pq A. 12 B. ...
waec-2019ssce-exam-2019waec-mathematics-2019math
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if 3p = 4q and 9p = 8q -12, Find the value of pq
A. 12
B. 7
C. -7
D. -12
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peter
Asked by peter•rep:1.8K
University of Lagos • Nigeria
02 May 2020
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judziy
Judziy answered•rep:2.0K
University of Benin • Nigeria
20 July 2020
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3p = 4q --- eqn(1)
9p = 8q - 12 -----eqn(2)
from eqn(1), p = 4q/3 ------- eqn(3)
Substituting eqn(3) into eqn(2)
9(4q/3) = 8q - 12
36q/3 = 8q - 12
12q = 8q - 12
12q - 8q = -12
4q = -12
q = -3
Now, we substitute q = -3 into eqn(3)
p = 4(-3)/3
p = -4
Therefore pq = -3 x -4
= 12
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