exam Maths Puzzle Numerical Ability

graph equation

y=2x+1

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exam Other Question

36. lines through (-2,0) with slope -3/4.

38. line through (0,9) that is parallel to the line 3x + 5y =15.

40. line through (-2,4) that is perpendicular to the x-axis.

42. slope intercept form. y + 2 = -6 (x-1)
what is a similarity ration & can you give me an example, please?