exam Maths Puzzle Numerical Ability

how do you solve 9x-3y=9 and x+3y=11 using graphing or eliminTION

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I am not sure if I am doing this problem correctly could I please have some help. The additive inverse of a number divided by twelve is the same as one less than three times its reciprocal. Find the number. I have x+2x=3/10 x=1/10
Thank you. write a formula that expresses the realtionship described below. Match your result to the correct answer below.

r varies to t and r = -4 when t = 2 answer is r = -2t