exam Maths Puzzle Numerical Ability

how do i draw a line of best fit on a scatter plot?

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exam Other Question

3x+6y=9
4x+5y=15
x-y+4=0
5x+15+5y=10x
2x+2y-4=x+5

Examples that my teacher gave me to help me out, but i still don't understand. so can you please hel
4x=-3y+5
8x=9y
solve each matrix eqaution or system of inequalities by using inverse matrices.
I got the rest of the problems but I don't know how to this one because I

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