exam Maths Puzzle Numerical Ability

c + 20 = 55 - 4c

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exam Other Question

I am having a hard time understanding how to find the slope of an equation.

the problem is:

y = -10x + 7

i gave the problem a shot, and i came up with 0.7 as the answer. if anyone can help...thank you in advance!!! How do you write an equation for the relation in the chart ??
x -2 0 2 4
y 9 5 1 -3