The perimeter of the square below can be described by the expression 64 + 12y. A square. Which of the expressions describes the
length of one side of the square? A square has 4 equal sides. StartFraction 64 over 4 End Fraction = 16; StartFraction 12 y over 4 End Fraction = 3 y 16 + 12y 4 + 12y 4 + 3y 16 + 3y
We are being asked whether the point (4, 27) is a solution of y = 3x + 15
So how do we figure this out? Well, what we have to know first that (4, 27) represents a variable, 4 which is the run on the graph, represents x in a solution. And 27 which is the rise on the graph, represents y in the solution. So when asking for a solution with two points, all we must do is substitute x and y for the two coordinates.
y = 3x + 15
y = 27 and x = 4
27 = 3(4) + 15
27 = 12 + 15
27 = 27
Since this equation is true with the respected variables, therefore signifies that (4,27) is a solution of y = 3x + 15
