-5
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y = 5x - 10
The line intercepts the x axis when y = 0.
0 = 5x - 10
10 = 5x
2 = x
Therefore the line intercepts the x axis at (2,0)
If y equals 5x-15 and x equals 1 then the value of y comes out to be -10. So y equals 5x-15 is -10.
y=-10 sin 5x sin 5x=y/-10 x=asin(y/-10)/5
To work out y=-5x-10 you can plot a graph.
15
15