That depends on the relationship between x and y.
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With the information that is given in the question, the value of y could be anything that you want.
x+y=27 x=14 27-14=y y=13
Then y = 3x.
If you mean: y = 3x+1 then the value of y will equal 10
You are basically looking for an equation with an x and y value where when 4 is set as x, y would equal 7. An equation of this is: 3 + x = y when x = 4, then y = 3 + 4 = 7
The y-intercept is the value of a function f when x is equal to zero. So, substitute 0 for x into the equation and find the value of y.