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

Find an exponential function of the form f(x) = ba^x +c with y-intercept 2, horizontal asymptote y= -2, that passes through the point P (1,4)

possible answers:
f(x) = -2(2^x)
5m+2(m+1)=23