Question

sove by substitution method 12p _7q=20 , 17p + 13q=16.​

Answer 1

Answer:

12p-7q=20

p=20+7q/12......eq.1

17p+13q=16......eq.2

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putting the value of pin eq.2.

then,

17(20+7q/12)+13q=16

340+119q/12+13q=16

340+119q+156q=192

275q= -148

q= -148/275........

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Answer 2

using of substitution method

12p-7q=20 .....(1)

17p+13q=16 .....(2)

$p = - 1.5 \\ q = - 19.4$