exam Maths Puzzle Numerical Ability

Solve the system;

x+y=20
x-y=8

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exam Other Question

Can you help me write an equation of the line having the following properties.
-passes through (-5,3) and is perpendicular to the x-axis The population of a town experiences growth. The quadratic equation for this problem is P=7t^2+P0. I am having a difficult time trying to tsolve this equation. The variables I h