exam Maths Puzzle Numerical Ability

Solve the system by graphing.
3x + y = -1
9x + 3y = -3

Please help me graph and solve this graphing system, I am not understanding how to solve these problems. Thanks

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exam Other Question

solve each system by elimination. check your answers.

-x-y-2z=4
-x+2y+z=1
-x+y-3z=11 Find the equation (in standard form) of the line through (1, �7) and (4, �1). Match your result to the correct answer below.
A) 2x + y = 9
B) x-2y=18
C) 2x � y = 9
D) x-2y=9