book Maths Puzzle Numerical Ability

What is a perpendicular lines on a graph

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The wages of 3 newspaper carriers totaled $108 for 3 weeks work. How much will 4 carriers earn if they work for 4 weeks each at the same weekly rate? please help me with my homework. i've already tried sketching the graph but i'm not sure if it's right.i'm confused with the problem. i hope you can help me . it's alright if you