exam Maths Puzzle Numerical Ability

solve using matrix methods

x + 4y = 8
2x + y = 9

Thank you for your help.

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exam Other Question

Evaluate

f(-2/3) if f(x) = x/2 15. Find the x-intercepts.

y=x^2-2x+4

x^2-2x+4=0

I then tried to factor however, there are no multiples of four that would equate to two. What am I not doing?