exam Maths Puzzle Numerical Ability

Compare equations with one variable to equations with two variables.
How are they alike? How are they different?
What if an equation had three variables?

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exam Other Question

How do I convert "y=(-1/3)x+5", in Slope Intercept Form ("y=mx+b"), to Standard Form (Ax+By=C)? Can someone help me solve this problem?
I need to compare the population per square mile in Asia to the population per square mile in North America for the year 2000.
Asia popu