Question
What is the value of the unknown in the following equations? [4 MARKS]
(i) 2x+4=10
(ii) 11x−7=5(x+7)
(iii) 7m+192=13
(iv) 2y+52=372
Answer: Option A
:
Each part: 1 Mark each
(i) 2x+4=10
⇒2x=10−4
⇒2x=6
⇒x=62=3
(ii) 11x−7=5(x+7)
⇒11x−7=5x+35
⇒11x−5x=35+7
⇒6x=42
⇒x=426=7
(iii) 7m+192=13
7m=13−192
7m=26−192
7m=72
m=72×7
m=12
(iv) 2y+52=372
2y=372−52
2y=37−52
2y=322
y=324
y=8
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:
Each part: 1 Mark each
(i) 2x+4=10
⇒2x=10−4
⇒2x=6
⇒x=62=3
(ii) 11x−7=5(x+7)
⇒11x−7=5x+35
⇒11x−5x=35+7
⇒6x=42
⇒x=426=7
(iii) 7m+192=13
7m=13−192
7m=26−192
7m=72
m=72×7
m=12
(iv) 2y+52=372
2y=372−52
2y=37−52
2y=322
y=324
y=8
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