Linear (Leaving Cert Mathematics): Quizzes

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What is the general form of a linear function?

f(x)=mx+bf(x) = mx + b

In f(x)=mx+bf(x) = mx + b, what does mm represent?

The slope of the line

In f(x)=mx+bf(x) = mx + b, what does bb represent?

The yy-intercept

What is the slope formula using two points?

m=y2−y1x2−x1m = \frac{y_2 - y_1}{x_2 - x_1}

Using points (1,5)(1,5) and (0,3)(0,3), what is the slope?

22

What is rise over run?

Vertical ÷ horizontal distance

What is needed to find the equation of a linear function?

One coordinate and the slope

Are yy and f(x)f(x) interchangeable in linear functions?

Yes, they mean the same thing

In P(n)=15n+100P(n) = 15n + 100, what does the 100 represent?

Base pay per day

In P(n)=15n+100P(n) = 15n + 100, what is P(0)P(0)?

€100

What is a positive relationship between variables?

As one increases, other increases

What type of relationship exists between price and demand in D(p)=150−5pD(p) = 150 - 5p?

Negative relationship

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