exam Maths Puzzle Numerical Ability

Find an equation of the line that goes through (1,3) and is perpendicular to the line through (0,8) and (-2,0)

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exam Other Question

Would the equation of the line with x-intercept (-,0) and undefined slope be: x = 0?? Thanks! I need help solving the following non-linear systems please!!
x^2+y^2=25
y=x^2-5

Thanks!