ashleyrturner08
31.12.2021 •
Mathematics
Prove algebraically that the straight line with equation x = 2y + 10 is a tangent to the circle with equation x² + y² = 20
My working:
x=2y+10
x²+y²=20
4y²+40y+100+y²=20
5y²+40y+100=20
5y²+40y+80=0
5(y²+8y+16)=0
y²+8y+16=0
(y+4)²=0
y=-4
x=2y+10
x=-8+10
x=2
x=2, y=-4
Solved
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Ответ:
Yes. It looks correct. (2,-4)
Step-by-step explanation:
The calculation looks good. I took the easy way out: graph the two equations and see if and where they intersect.
See attachment
Ответ:
107.50-21.50=$86 for 5 days