What is the H.C.F. of 12 and 18?

A. 6

Which of the following pairs of equations represents parallel lines?

A. Y = 2X + 1 AND Y = 2X - 3
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Which of the following pairs of equations has no solution?

A. X + Y = 5 AND X + Y = 10
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Solve the following system of equations using substitution: y = 2x + 3 and 3x - y = 5. What is the value of x?

B. 2
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Which of the following is a rational expression?

C. 1/(X - 3)