exam Maths Puzzle Numerical Ability

Find the solution by substitution:
4x+3y=5
2x-y=-5

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exam Other Question

can someone please help me with this question:

Is this function always increasing, decreasing, remaining constant, or there is no way to know ?

y = 0(-x + 1) 8-5(4-3x)=2(4-x)-8x