exam Maths Puzzle Numerical Ability

Solve for ( x, y)

6x - 2y = 16
y = 2x - 4

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exam Other Question

TJustin is riding his bicycle on 30 mile tour. Once he has ridden 8 miles, what percent of the tour has he completed? Can someone show me how to solve the quadratic equation and graph? I'm stuck.

-3y=X^2+3x+5