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There is no symbol between 5x and 4. Also, it is necessary to define either the domain (possible value of x) or range (possible values of y) since otherwise there are infinitely many ordered pairs.
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They are all the pairs you make where (x = any number) and (y = 4).
x = 3 and y = -4
5x + 4 = 10x - 5 10x - 5x = 4 + 5 5x = 9 x = 1.8
Great. A multiple choice question without the choices.
If -4 + 5x = 6, 5x = 6 +4 = 10 or x = 2.