R - 9S = 2 3R - 3S = - 10

R-9s=2 add 9s to both sides

r=2+9s making 3r-3s=-10 become:

3 (2+9s) - 3s=-10 perform indicated multiplication on left side

6+27s-3s=-10 combine like terms on left side

6+24s=-10 subtract 6 from both sides

24s=-16 divide both sides by 24

s=-16/24

s=-2/3, making r-9s=2 become:

r-9 (-2/3) = 2 perform indicated multiplication on left side

r+6=2 subtract 6 from both sides

r=-4

So s = - 2/3 and r = - 4