Question

Solve the simultaneous equations by substituting method
3x-y = 5, 4x - 3y = -1.
Hence, find p.
if y=p-3​

Answer 1

Answer:

38/5

Step-by-step explanation:

$3x - y = 5 \\ = > 3x = 5 + y \\ = >x = \frac{5 + y}{3} \\ now \: \\ = > 4x - 3y = - 1 \\ = > 4 (\frac{5 + y}{3}) - 3y = - 1 \\ = > \frac{20 + 4y - 9y}{3} = - 1 \\ = > 20 - 5y = - 3 \\ = > - 5y = - 23 \\ = > y = \frac{23}{5} \\ now \\ y = p - 3 \\ = > p = y + 3 \\ = > p = \frac{23}{5} + 3 \\ = > p = \frac{23 + 15}{5} \\ = > p = \frac{38}{5}$