How do you solve (y=x-4)=(2x+y=5) using substitution?
2 answers:
Y = x-4
2x + y = 5
2x + (x-4) = 5
3x - 4 = 5
3x = 9
x = 3
Substitution is done by replacing a variable for an equation. In this case:
2x+y=5
would be
2x+(x-4)=5 (If you notice, you see that the value of x was replaced in the main equation)
Then you would solve as normal.
2x+x-4=5
3x-4=5
3x=9
x=3
Then we can plug in x for any one of the equations to find y.
y=x-4
y=3-4
y=-1
So the solution is x=3 and y=-1.
:)
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<u><em>answer may vary sorry i could not seem to get this question sorry try asking someone else </em></u>