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Use addition to solve the linear system of equations. Include all of your work in your final answer. x - y = 4 x+ 2y = 4
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3 votes
Use addition to solve the linear system of equations. Include all of your work in your final answer.

x - y = 4
x+ 2y = 4

User Tsgrasser
by
5.4k points

1 Answer

3 votes
we have that
x - y = 4-------> multiply by -1-----> -x+y=-4-----> equation 1
x+ 2y = 4------> equation 2

add equation 1 and equation 2
-x+y=-4
x+2y=4
-----------------
0+3y=0-----> y=0
x+2y=4------> x+0=4------>x=4

the solution is the point (4,0)
User Xdzc
by
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