exam Maths Puzzle Numerical Ability

For the systems of linear equations in questions 1-3
- Determine how many solutions exist
- Use either elimination or substitution to find the solutions (if any)
- Graph the two

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exam Other Question

We are struggling with these problems. Thank you
Find the variation constant and an equation of variation where y varies directly as x and y=80 when x=10.

The variation constant is K=_____
The equation of variation is y=_____ Find sec Θ if tan Θ=1/4 aand 180�<270�.

Thanks