exam Maths Puzzle Numerical Ability

solve by graphing; estimate the coordinates of the intersection point to the nearest half unit.
x+y=-2; 2x-y=10

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THIS ONE HAS ME REALLY CONFUSED. I KNOW THE ANSWER IS SIMPLE AND I AM JUST MAKING MORE OF IT, BUT IT HAS BE WHIPPED. I HAVE TO SHOW ALL WORK TO SOLVE FOR x.

6 - x + 12 = 10x + 7 Six different positive numbers(excluding zero) are added together, and their sum is 11. Four of the numbers are 4, 3, 2, and 1. Find the other two numbers.