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What is the equation of the horizontal line through (-7, -3)?
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Answer:

y=-3

Explanation:

The equation of a line is y=mx+c, where m is the gradient and c is the y-intercept (the point where x is 0 and y has some value).

First, we have to find the gradient and for all horizontal lines, the gradient is 0 because gradient is the rate of change in x with respect to y and y is not changing so there is no gradient since there is no change.

Anything times 0 is 0 so we can write the equation as y = c now plug in the y value and find c.

c= -3

Replace c in the equation and we get y=-3

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