Question

please solve quickly (substitution method)
4p +3q=14
3p-4q=23
the answer is p=5 and q= -2
but how please tell me by step by step????? please help..​

Answer 1

Answer:

4p + 3q =14

p=( 14-3q)/4. -EQ(1)

3p - 4q=23. - EQ(2)

substitute (1) in (2)

3[(14-3q)/4] -4q =23

(42-9q-16q)/4=23

42-25q=23(4)

42-25q=92

-25q=92-42

-25q=50

q=-(50/25)

q=-2

substitute q in EQ(1)

p=(14-3(-2))/4

p=14+6/4

p=20/4

p=5

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