exam Maths Puzzle Numerical Ability

What is the gradient of the graph of the linear equation 7x-4y=28?

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Please help me solve this equation:

5x^-4 after the little arrow its suppose to be a negative 4. So its 5 times x and then a negative exponent which is negative 4

Thank You An airplane took 2.5 hours to fly 625 miles with the wind. It took 4 hours and 10 minutes to make the return trip against the same wind. Find the wind speed and the speed of the