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Solve Linear Equation in Two Variables
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 6. Cramer's Rule Method Solve linear equations 12x+5y=7 and x+y=7 using Using Cramer's Rule MethodThe equations can be expressed as 12x+5y-7=0x+y-7=0Use Cramer’s Rule to find the values of x, y, z.(x)/D_x=(-y)/D_y=(1)/D D_x =|[5,-7],[1,-7]| = 5 × -7 - -7 × 1 = -35 + 7 = -28 D_y =|[12,-7],[1,-7]| = 12 × -7 - -7 × 1 = -84 + 7 = -77 D =|[12,5],[1,1]| = 12 × 1 - 5 × 1 = 12-5 = 7(x)/D_x=(-y)/D_y=(1)/D:. (x)/-28=(-y)/-77=(1)/7:. (x)/-28=(1)/7,(-y)/-77=(1)/7:. x=(-28)/(7),y=(77)/(7):. x=-4,y=11