exam Maths Puzzle Numerical Ability

Write the equation of a line whose slope is 6 and whose y intercept is -3.

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exam Other Question

Solve the system of equations for x and y:
4^(x+y)=1/64 & sqrt6^(x+8y)=216^2/3
Can someone please tell me if I have the correct answer???? I got x=-4 and y=1? Could someone help me to solve
2x^2+3x-1 using the quadratic formula which is -b+-(sqrt)b^2-4ac/2a

Thanks so much for your help in advance!