exam Maths Puzzle Numerical Ability

Please help me to solve these equations using the elimination method?

0.06x+0.05y=0.07
0.4x-0.3y=1.1


-4.5x+7.5y=6
-x+1.5y=5


17x+21y=1
17x-5y=6

Thank you

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exam Other Question

(3x+7)(2x-5) For this problem do I sub each given in the place of f or for x?

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f (x) = x2 - 7x + 10; find (a) f (0), (b) f (5), and (c) f (-2).