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6. If the values of X and Y in the solution of {4x + 3Y = 14 KX + (k-1) y = 6 are equal, then the value of K is () A.4 B.3 C.2 D.1 7. If {4x + 5Y = 5x + 4Y = 7, then the value of X + y is () A.12 B.-2 C.4/3 D.3/4 8. If the solution of the binary linear equations {x + y = 5K, X-Y = 9K is also the solution of the binary linear equation 2x + 3Y = 6, then the value of K is () A.-3/4 B.3/4 C.4/3 D.-4/3
6C
7C
8B
Given - x + 2Y = 5, then the value of 5 (x-2y) ^ 2 - (x-2y) - 50 is ()
A.80 B.10 C.-210 D.40
-x+2y=5
x-2y=-5
5(x-2y)^2-2(x-2y)-50
=5*(-5)^2-(-5)-50=125+5-50=80
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