exam Maths Puzzle Numerical Ability

Hi Everyone, I was supposed to solve x^2+10=19....I came up with the solution of +(w/a line under it)3 Am I correct??? I would appreciate anyone reviewing this problem for me...Thanks

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exam Other Question

4 times a number, decreased by 2, is 26. Find the number. What is the slope of the line whose equation is 5(2x-3) = -8y+2?