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Working with the method of substitution

Please help me with #4, #10, and #16. I am having trouble woth these. Please show your work so that I may better understand the process.

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So let us see how to solve equations by the method of substitution.

The substitution method is used to eliminate one of the variables by replacement when solving a system of equations.

Think of it as "grabbing" what one variable equals from one equation and "plugging" it into the other equation.

4)
2x + 7y = 4 ...(1)
x + 3y = 1.....(2)
we can write 2 as, x = 1 - 3y ...

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Clear explanations and all mathematical steps are provided.

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