Write an equation is slope-intercept form for the line parallel to y=7x+9 that passes through (4,10)

Since they are parallel, the co-efficient of x will be the same. So m=7.
Y=Mx+c. So if we substitute the values with the coordinates, we get 10= (7*4) +c . Therefore c= -18.
So the final answer is:

Y=7x - 18

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The dimensions of the rectangle are 40 feet by 24 feet. The formula for calculating the length of the diagonal is a^2 + b^2 = c2. 40^2 + 24^2 = c^2. In this case the answer is 46.6