Long description: block7-fig4

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Three graphs illustrate the relationship between the gradient, \(a\), and the equation of a straight line, \(y=ax+b\).

Alt text: Three graphs illustrate the relationship between the gradient, \(a\), and the equation of a straight line, \(y=ax+b\).

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  • The first graph shows a line sloping upwards from the origin, labeled "a is positive", indicating a positive gradient.
  • The second graph displays a line sloping downwards, labeled "a is negative", indicating a negative gradient.
  • The third graph shows a horizontal line parallel to the x-axis, labeled "a is zero", indicating a zero gradient.

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