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(i) x+y=12. Find y if x=5. (ii) x+3y=-...

(i) x+y=12. Find y if x=5.
(ii) x+3y=-4 `therefore` x = ……… …. (Fill in the blanks.)
(iii) Find x, if x+y=5 and x-y=7.

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(i) y=7 (ii) -4-3y (iii) x=6.
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