Question

3x+2y/5=20;x/3+y=21 find simultaneous equation

Answer 1

Step-by-step explanation:

$\frac{3x + 2y}{5} = 20..........(1) \\ \\ \frac{x}{3 + y} = 21.........(2) \\ \\ 3x + 2y = 100........(3) \\ \\ x = 63 + 21y.......(4) \\ \\ x - 21y = 63.........(5) \\ \\ \\ let \: add \: 3 \: into \: 5 \\ \\ 3x + 2y = 100 \\ x - 21y = 63 \\ 3x + x + 2y - 21y = 163 \\ \\ 4x + 19y = 163$