exam Maths Puzzle Numerical Ability

I AM SO CONFUSED. I HAVE A GRAPH THAT I NEED TO FIND THE SLOPE.
IT HAS A STRAIGHT ARROW GOING UP PASSING THROUGH 0 AND 5?? THANKS

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exam Other Question
Please solve the equation using the zero-factor property. Thank you

5x^2+12=23x Find A intersection B, given A = {0, 1, 2, 4} and B = {0, 1, 3, 4}.