Question

The equation of a line is x + 3y = 14.

What is the y-intercept of the line?

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Answer 1

The y-intercept means where does the line cross the y-axis (the vertical axis)
that happens when x is 0
if we make x be 0 in the equation
x+3y=14
0+3y=14

adding zero does not change the sum, so we can just write
3y= 14

to find "y" , divide both sides by 3
can you do that ?