exam Maths Puzzle Numerical Ability

hi I do not undrestand solving using substitution method for example
x=y-1 x=y+6 r=-3s
y=4-2x y=-2-x r=10-4s

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exam Other Question

y=3x-1
and
y=negative2x

The x and y are the same in both problems. determine the equation of the line, in slope-intercept form, that contains the points
(-5,9) and (-5,-2)