exam Maths Puzzle Numerical Ability

Find the slope and y-intercept.

x=-8

please help me solve this

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my instructor told me to substitute and then use logarithm
but im not quite sure how

10^2x-2(10^x)=0
to substitute like she said i used 10^x as y
so
y^2-2(y)=0
y^2-2y= how do you solve problem(8-20x)cubed=-1000?