book Maths Puzzle Numerical Ability

determine the equation of the line that :

has a slope -1/2 and y intercept 7

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book Other Question

Subtract 4-7i from -8-9i hi
i dont understand how to write these equations in standard form using integers.
the problems are:
1.y=-x/3+2/3
2.y=4x-11
3.y=-4/5x=/65
PLEASE HELP ME ASAP
THANKS!!