If you mean, "x-3y = 12", then xy = 3y2 + 12y.
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If x - 3y = 12, we can solve for x in terms of y: x = 12 + 3y. Then, to find xy, we multiply x by y: xy = y(12+3y) = 12y + 3y^2.
The congruent sides of an isosceles triangle are the two sides that are equal in length. These two sides are opposite the equal angles of the triangle. The third side, called the base, is not equal in length to the other two sides.
One meter is equal to 0.001 kilometers.
Pi is a mathematical constant that is approximately equal to 3.14159. It is the ratio of a circle's circumference to its diameter.
21 out of 35 is equal to a grade of 60% when converted to a percentage.
1908 minus 1776 is equal to 132.