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Anonymous
We don't know and we can't calculate it, until the value of 'x' is given.
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5x - 4x = 13 - 3 ie x = 10
x=3
4x+3/3=y
If: 20x+5y = 15 Then: y = -4x+3
Simplify 4x + 3 = 2x + 8 2x = 5 x =2½