exam Maths Puzzle Numerical Ability

Graph the equation and identify the y-intercept.

x+4y=8

The y-intercept is ?

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exam Other Question

This problem I dont even know how you could graph it. I need help.
The problem goes like this: If x and y are integers, find the domain of { (x,y) : |y|= x and x_<4} graph the relation. Is it a function? find a number whose square is 36 greater than 5 times the number.