exam Maths Puzzle Numerical Ability

Solving Systems of Equations in Three Variables.
2r+s+t=14
-r+-3s+2s=-2
4r-6s+3s=-5
How do i get to the two systems of the equation using elimanation and to find the first variable?

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exam Other Question

(-10m^-1y^0r)/(-14m^-7y^-3r^-4)i got 10m^8y^3r^4 am i right? Which of the following equations describe the same line as the equation 1/2x-5y=1?
(a) 2x-1/5y=1
(b) x=5y+2
(c) 2-5x+10y=0
(d) y=.1(x-2)
(e) 10y-x= -2
(f) 1+.5x=2+5y