book Maths Puzzle Numerical Ability

Determine which two equations represent parallel lines.

a. y = -7x + 1
b. y = 7x + 1
c. y = 1/7x + 1
d. y = -7x + 2

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book Other Question

make up a word problem that you can solve using a linear system with solution of(5,35) USING A COMBINATION OF 24% NITROGEN AND 12% NITROGEN TO ACHIEVE AN END RESULT OF 100 GRAMS OF 21% NITROGEN.