exam Maths Puzzle Numerical Ability

by using subsitution of linear systems how do you figure out this problem?

x+y=4
-5+2y=-6

PLEASE HELP CUZ IM NOT UNDERSTANING THIS

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exam Other Question
Factor:

6x2nd power + x -2 Solve the pair of equations:

x/a + y/b = 2
ax - by = a^2 - b^2