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Rearrange 4(2x + y) = 11 + 7y to make x the subject

4(2x + y) = 11 + 7y expand the brackets8x + 4y = 11 + 7y move +4y to the other side8x = 11 + 3y move 8 to the other sidex= (11 + 3y)/8

Answered by Ashley Y. • Maths tutor

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The equation of a quadratic curve is y=x^2+ax+b. The points (6,-4) and (4,-6) lie on this curve. Find the co-ordinates of the turning point of the curve.

If y=x^2 + ax + b is the equation for the curve, then the points which lie on the curve must satisfy this equation.Inputing the points into the equation gives:-4 =6^2+6a+b -6=4^2+4a+bNow solve simultaneou...

Answered by Sena A. • Maths tutor

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3^a = 1/9, 3^b = 9sqrt(3) c = 1/sqrt(3). Work out the value of a + b + c

I will explain best during the interview on the whiteboard space

Answered by Eduardo C. • Maths tutor

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A plane travels at 213 miles per hour. Work out an estimate for how long, in seconds, the plane takes to travel one mile.

213 miles/hour speed = distance/time
round 213 to 200 as only an estimate;
s=200/1 hour = 200/3600 seconds (then divide by 200 to get time for 1 mile)s = 1/18
at this speed, the plane trave...

Answered by Owen W. • Maths tutor

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