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5x=10 5x/5=10/5 x=2
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.
5x+25=10 5x+25-25=10-25 5x=-15 5x/5=-15/5 x=-3
To work out y=-5x-10 you can plot a graph.
240-10=5x 5x=230 230/5=46 x=46