exam Maths Puzzle Numerical Ability

Consider the equation ky+2x=7. For what will be the value of k if the slope is 1?

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and this problem also. Thank you so much..

f(x)=2x^2-8x+3
What is the vertex A triangle has a side 100 feet long and a second side 35 feet long with a 25 degree angle between them. What is the approximate area of the triangle?