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grade8_graphs_quiz2 draws its questions at random from a bank of 10 questions, with full worked solutions for every one.
A few of the question types, with full solutions, so you know what to expect.
Use \(y=2x+1\). What is the value of y when \(x=-2\)?
\(y = 2x+1\)
\(y = 2(-2)+1 = -4+1\)
Use \(y=x+3\). If \(x=-2\), what is the correct ordered pair?
Answer: (-2;1)
\(y = x+3 = -2+3 = 1\)
\(\text{Ordered pairs are written } (x;y)\text{, with x first.}\)
Use \(y=x^2+2\). What is the value of y when \(x=-1\)?
\(y = x^2+2\)
\(y = (-1)^2+2 = 1+2\)
Is the relationship \(y=2x+1\) linear or non-linear?
Answer: Linear
\(\text{Plotting the ordered pairs of } y=2x+1 \text{ gives points that form a straight line.}\)
Is the relationship \(y=x^2+2\) linear or non-linear?
Answer: Non-linear
\(\text{Plotting the ordered pairs of } y=x^2+2 \text{ gives points that form a curve, not a straight line.}\)