Math Club (Grade 8)

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Given the simultaneous linear equations x − y = 10 and 3x − 4y = 20, the correct

substitution statement is ... .

• 3x − 4(x − 10) = 20

• 3x − 4(x + 10) = 20

• 3x + 4(x − 10) = 20

• 3x − 4(10 − x) = 20

Alex and Rudiart went to the stationery shop, each of them brought IDR15,000. Alex bought 2 books and 1 pen, and got IDR2,000 in change, while Rudiart bought 1 book and 5 pens, and got IDR4,000 in change. So, the price of a book is ... .

• IDR3,000

• IDR4,000

• IDR5,000

• IDR6,000

The relation from set A to set B is ... .

• more than

• less than

• factor of

• multiple of

Given that f(x) = ax + b. If f(4) = 18 and f(−1) = −7, then the value of f(−3) is ... .

• −17

• −15

• −13

• −11

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• 
• 

The gradient of line through the point P(−1,3) and Q(−5,1) is ... .