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

Write the equation of the line L if L has y-intercept (0,2) and is perpendicular to the line with equation 2x-3y=6. I am given the problem of to find the surface area of a rectangular prism. All that is given is a lengt of 5 a height of 10 and a width of 7. How do i find the surface area