3. What is the equation of a line with a slope of -2 and a
y-intercept of (0,-7)?

y = -2x - 7

Step-by-step explanation:

The general formula of a linear graph is y = mx + c

where m is the gradient and c is the y-intercept

The slope (aka gradient) is -2, hence m= -2

and the y-intercept is -7, hence c = -7

Therefore, y = -2x + (-7)

                  y = -2x - 7

Step-by-step explanation:

m = -2

y-intercept = -7

In y=mx+b (slope intercept form) ,

m = slope

b =y-intercept

Substitute the given values into  slope intercept form

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