Question

Selve each system of equations using substitution method.
8p+7q=43
2p-7=-q​

Answer 1

Answer:

8p + 7q = 43. …eq (i)

2p - 7 = -q

q = -(2p-7) ...eq (ii)

Substituting this in eq (i)

8p + 7 × {-(2p-7) } = 43

8p + 7 × {-2p+7} = 43

8p + (-14p) + 49 = 43

8p - 14p = 43 - 49

-6p = -6

p = 1

Substituting this value in eq (ii)

q = -{2(1) - 7}

q = -2+7

q = 5