exam Maths Puzzle Numerical Ability

I dont understand how to solve problems such as this....
5x-16=3x

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exam Other Question

Plot the point with coordinates (-4, 3). 1) y=x
y=-x

2)y=-x
y=x+9

i have 12 problems just like this, and the instuctions
in the book i dont get. pleezzz help thank you