exam Maths Puzzle Numerical Ability

Is 15 a solution to the equation 8 - x = 7?

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exam Other Question

If a line passes through (3,-1) and is perpendicular to the graph of y=(-1/3)x-4,what would the slope-intercept form be? solve each of the following systems by graphing...
2x -y = 4, 2x -y = 6