3. Find the indicated angle or side. Give an exact answer. Find the measure of angle A in degrees.
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Solve 2x+y=3 x+y=5 in substitution method

The base of a triangle exceeds the height by 7 centimeters. if the area is 400 square centimeters, find the length of the base and the height of the triangle.

Sundar used linear combination to solve the system of equations shown. he did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. what number did sundar multiply the second equation by? 2x+9y=41 3x+5y=36