exam Maths Puzzle Numerical Ability

A small firm produces both AM and AM/Fm car radios. The AM radios take 12h to produce, and the AM/FM radios take 20h. The production hours is limited to 300h per week. The plants c

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exam Other Question

Determine which two equations represent parallel lines.
a)y = 3x - 5
b)y = -3x + 5
c)y = 3x + 3
d)y = -1/3x -5

Any help would be greatful. AT&T charges $30 after 250 minutes and $45 after 1000 minutes. Write an equation to represent the situation.