It's only true when x=5.
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19-2x=13 19 -13 ------ 6 6/2=3 19-(2)(3)=13 x=3
2x+7x-10=4x+3-2x 9x-10=2x+3 7x=13 x=13/7ans
X= -8
If you meant 2x+3=4x²x=(1±√(13))/4x1≈1.151387818866x2≈-0.651387818866
2x-3y=13