exam Maths Puzzle Numerical Ability

How do you find points when there is no x like 2y=5
or how do I find a point when there is no y like x+6=0

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exam Other Question

Dividing radical expressions

3 over 5 + cube root 5

6 - 2 cube root 3 over 4 + 3 cube root 3

cube root a - 4 over 2 cube root a + 2 Ver confused with this one Solve sytem of linear equation express in ordered pai (x,y) if possible use substitution or addition method

x- 5/3y=7
4/7x + y=-13/7

thanks, please show me steps

dnn