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What is the equation of the horizontal line that has y- intercept of -4

Verified Answer :

Since the line is horizontal (flat) the gradient, m, is  zero (0). c is the y-intercept and in this case -4.

Equation of a line: y = mx + c

since m = 0 then,

y = c = -4

therefore y = -4 ...is the equation.

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