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Amanda [17]
3 years ago
9

Simultaneous equationsx+y=5x squared-y squared=15​

Mathematics
2 answers:
expeople1 [14]3 years ago
4 0

Answer: x=4, y=1.

Step-by-step explanation:

\left \bigg \{ {\big{x+y=5} \atop\big {x^{2}-y^{2}  =15}} \right.\\\\x+y=5\\x+y-y=5-y\\x=5-y\\\\(5-y)^{2} -y^{2} =15\\5^{2} -10y+y^{2} -y^{2}=15\\25-10y=15\\25-10y-25=15-25\\ -10y=-10\\-10y \div (-10)=-10 \div (-10)\\y=1\\\\x+y=5\\x+1=5\\x+1-1=5-1\\x=4

Oxana [17]3 years ago
3 0

Answer:

(4,1)

Step-by-step explanation:

easiest method is to graph each equation and look for point(s) of intersection

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Jada is using 84 one-centimeter cubes to build a rectangular prism. She wants the height of the rectangular prism to be 4 centim
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Step-by-step explanation:

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