X + k y = 1
k x + y = 1 / * ( - k )
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x + k y = 1
- k² x - k y = - k
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x - k² x = 1 - k
x ( 1 - k² ) = 1 - k
x = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
y = 1 - k( 1 - k )/( 1 - k² )
y = ( 1 - k ) / ( 1 - k² ) = ( 1 - k ) / ( 1 - k ) ( 1 + k )
a ) For k = - 1 this system has no solution.
b ) For k ≠ - 1 and k ≠ 1, the system has unique solution:
( x , y ) = ( 1/ (1 + k) , 1/( 1 + k ) ).
c ) For k = 1, there are infinitely many solutions.
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To graph an inequality, consider the < or > sign to be a = sign and graph the equation. If the inequality is < or >, draw a dotted line to represent the equation.
Graph the equation as a solid line if the inequality is ≤ or ≥, This line divides the xy-plane into two regions: one that meets the inequality and one that does not.
When inequalities are graphed on a coordinate plane, the solutions are found in a region of the plane that is shaded. If the points on the line satisfy the inequality, as in the case of and, the boundary line for the inequality is drawn as a solid line.
Linear inequalities are not the same as linear equations, but what you know about equations can help you understand inequalities. Equations and inequalities are both mathematical statements that compare two values.
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Answer:
less than mean subtraction
twice means 2 times
Step-by-step explanation:
can be made out of 
![131 \frac{3}{4}= \frac{[131*4]+3}{4}= \frac{527}{4}](https://tex.z-dn.net/?f=131%20%5Cfrac%7B3%7D%7B4%7D%3D%20%5Cfrac%7B%5B131%2A4%5D%2B3%7D%7B4%7D%3D%20%5Cfrac%7B527%7D%7B4%7D%20%20)
![3 \frac{7}{8}= \frac{[3*8]+7}{8} = \frac{31}{8}](https://tex.z-dn.net/?f=3%20%5Cfrac%7B7%7D%7B8%7D%3D%20%5Cfrac%7B%5B3%2A8%5D%2B7%7D%7B8%7D%20%20%3D%20%5Cfrac%7B31%7D%7B8%7D%20)
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