exam Maths Puzzle Numerical Ability

How do I find the y-intercept for -x + 3y = 15?

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PLEASE HELP SOLVE.

DETERMINE WHEATHER THE FOLLOWING IS PERPENDICULAR, PARALLEL OR NEITHER

PROBLEM # 1 : 2X+5Y=-8 AND 6+2X=5Y
PROBLEM # 2 : 3X=Y AND 2Y-6X=5 walt made an extra $9000.00 last year from a part time job. he invested part of the money at 10% and the rest at 7%. he made a total of $780.00 in interest. how much was invested at 7%