Question

solve using cross multiplication method 2p - 7q = -1 and 4p + 3q = 15

Answer 1

Step-by-step explanation:

$2p - 7q = - 1 \\ 2p = 7q - 1 \\p = \frac{7q - 1}{2} \\ - - - - - \\ - - - - - \\ 4p + 3q =15 \\ 4 \times \frac{7q - 1}{2} + 3q = 15 \\ 2(7q - 1) + 3q = 15 \\ 14q - 2 + 3q = 15 \\ 17q = 17 \\ q = 1$

put the value of q in equation. 1 and find p

Hope it's helpful for you!

Answer 2

Answer: P = 3 , Q = 1

Step-by-step explanation:

            1/(a1b2 - a2b1) = x/(b1c2 - b2c1) = y/(c1a2 - c2a1)

            1/(6+28) = x/(105-3) = y/(4+30)

           1/34 = x/102 = y/34

            now 34x=102

                      x or P = 3

            now 34y=34

                       y or Q = 1