Question

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Answer 1

Take two points

• (0,0)
• (-2,-4)

Slope:-

`\\ \sf\longmapsto (-4)/(-2)=2`

Equation in point slope form

`\\ \sf\longmapsto y-y_1=m(x-x_1)`

`\\ \sf\longmapsto y=2x`

In slope intercept form

• y=2x+0

Answer 2

Explanation:

Line passes through origin (0, 0) so y-intercept is zero: b=0

At x=2, y=4 so slope is 4/2=2: m=2

Answer is y = 2x