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Well, it says to use a calculator to calculate them. So a calculator I would highly recommend is the Desmos graphing calculator.
The point-slope form of the equation of a line with slope m through point (h, k) is
... y - k = m(x - h)
Substituting your given values of m=2 and (h, k)=(3, 9) gives you
... C. y - 9 = 2(x - 3)
Answer:
length = 4x
width = 3x
perimeter = 56 m
also, perimeter = 2 (length + width) [from formula]
therefore, 2(4x + 3x) = 56m
2(7x) = 56m
14x = 56m
x = 56/14 m
x = 4m
