exam Maths Puzzle Numerical Ability

please help me with these: what intercept procedure do i use for 1/2y=4+x;
determine te slope and y-intercept by inspection y= -7/8x-3
Graph the euations using the slope-inter

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exam Other Question

1. find the product
(2x+5y)^4

I know that it is
1 4 6 4 1
the perimeter of a square garden is 56ft. What is the area of the garden?