exam Maths Puzzle Numerical Ability

I need help finding the y-intercept of y=4/3x.

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exam Other Question

A common mistake when solving equations is the following:

The equation: 2(x -2) = x +3

First step in solving: 2x -2 =x +3

Write a clear explanation of what error has been made. What could be done to avoid this error? (-7x-5x^4+5)-(-7x^4-5-9x)