Mathematics
JackofallTrades
11

using Cramers rule , what is the value of x in the system of linear equations below? -1/2x+3y=-4 -x-y=-1

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owenslize

If we have two equations: ax + by = e cx + dy = f denominator determinant (dn) = (a*d) -(c*b) x = [(e • d) - (f • b)] / dn A) -.5x +3y = -4 B) -x -y = -1 a=-.5 b=3 c=-1 d=-1 e=-4 f=-1 (dn) = (-.5*-1) - (-1*3) dn = .5 + 3 = 3.5 x = [(e • d) - (f • b)] / dn x = [(-4 *-1) - (-1 * 3)] / 3.5 x = (4 +3) / 3.5 x = 7 / 3.5 x = 2 Source: http://www.1728.org/cramer.htm

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