exam Maths Puzzle Numerical Ability

8x+9y=1
-2x+6y=5 solve this matrix. I am the older sister, who hasnt done matrix stuff since high school. I am trying to remember how to solve this equation. can you please help. sorry i didnt try, i doont have a book or anything.

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exam Other Question

The winning candidate had 220 more votes then the loser, if 810 votes were cast in all how many votes did each candidate receive
I put x= winning candidate and y= the losing candidate x + y= 810
y = 2x+ 220 this is where I get lost A chain store manager has been told by the main office that daily profit, P, is related to the number of clerks working that day, x, according to the equation P = -25x^2 + 300x. W