exam Maths Puzzle Numerical Ability

how i can graph 5x+2y+6=0
i rewrite the equation to y=-5/2x-3
the y intercpet is -3
the slope is-5/2
the x intersept is -6/5

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exam Other Question

Please help with this question. It is not froma book but a test review.

From past experience, a teacher believes that the average score on a geometry exam is 75. A sample of 2 I don't know how to solve this system. I know I should get 3 answers.
x+3y-z=-1
3x+2y+z=4
2x+5y+3z=-1