I’ll give out crown!!

Please explain the answer, because I wanna understand why.

2x+6y=12
10x+30y=40

What is the solution to this
system?

1: the ordered pair (5,20) is the solution

2: the ordered pair (-5,0) is the solution

3: there is no solution to this system

4: there are an infinite number of solutions to this system.

Suppose there is a simple index of three stocks, stock abc, stock xyz, and stock qrs. stock abc opens on day 1 with 4000 shares at $3.15 per share. stock xyz opens on day 1 with 5000 shares at $4.30 per share. stock qrs opens on day 1 with 6000 shares at $4.60 per share. the price of stock abc on day 8 begins at $3.50. the price of stock xyz on day 8 begins at $3.90. stock qrs opens on day 8 with a price of $4.50 per share. assume that each stock has the same number of shares that it opened with on day 1. what is the rate of change of this simple index over 1 week?