Question 569135
x+5y = -15
y = 1/5x + 1 


Below is how I solved it:

x+5(1/5x+1)=-15
x+(x+5)=-15
x^2+5=-15
x^2+5-5=-15-5
x^2=-20


Is this correct ?
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x+5(1/5x+1)=-15 Sub for y is good.
x+(x+5)=-15  This is correct.
x^2+5=-15  ***  Don't multiply, add.
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2x+5 = -15
2x = -20
x = -10
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x^2+5-5=-15-5
x^2=-20