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Use addition or substitution to find the value of x for this set of equations. top line y = x - 2 bottom line 7y - 4x = 10

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1 Answer

since we have y = x - 2 , we can use substitution method. Let's replace y, in second equation by (x-2)
7(x-2) - 4x = 10 ---> 7x - 14 -4x = 10 ----> 3x = 14 + 10
                                                                3x = 24
                                                                  x = 8
Now, in first equation, let's replace "x" by 8 ---> y=8-2=6
The answer is the pair of numbers (8,6)