exam Maths Puzzle Numerical Ability

Solve the following systems by substitution. Example 2 (p 712) and Example 4 (p 713) are the key models to go by for solving these exercises�.

8x - 4y = 16
y = 2x -

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exam Other Question

simplify:

(3x^3 - 1 + 9x) + (3 + 3x)
In 1920, the record for a certain race was 45.4 sec In 1970, it was 44.9 sec. Let R(t)=the record in the reace and t=the number of years since 1920.

a) Find a linear function t