exam Maths Puzzle Numerical Ability

how do you find f(x)=ax+b in which f(2)=1 and f(-3(=11?
from mathematics for the international student:Mathematics SL-section 1c

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exam Other Question

Find the dot product v dot w if v = i + j and w = -i + j. Which of the following is a reflection of f(x) = -x + 1 about the x-axis?

a. r(x) = x + 1
b. r(x) = x - 1
c. r(x) = -(x - 1)
d. None of the above