Any help with these?

Question

how?
solve. 2/5x = –10


Find Ex for the following set of numbers:
–3.5, –1.4, –0.5, 3, 5, 1, 2

Find the slope of the line passing through the points (10, –4) and (–4, –4).

Answer 1

2/5x = - 10

5/2(2/5)x = - 10(5/2)

x = - 50/2

x = - 25

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Ex I do not understand the question

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Slope formula

m = y₂- y₁/ x₂- x₁

m = 4 - (- 4) / 10 - 4

m = 4 + 4 / 10 - 4

m = 8 / 6

m = 1 2/6

or

m = 1 1/3
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Answer 2

if (2/5)*x = -10
x = (5/2)*10 =25

if 2/(5x)=-10
2 = -50x
x = -1/25

Ex ????

slope = 0