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How do you solve x=2y+7 and x=Y+4 using substitution?

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2 Answers

x=2y+7  equation 1
 
x=y+4
y=x-4  equation 2
 
substitute the value of y in equation 1
 
x=2(x-4)+7
x=2x-8+7
x=2x-1
x=1
 
substitute the value of x in equation 2
 
y=1-4
y=-3
 
 
Substitute x from first equation into second
 
2y + 7 = y + 4
 
y = 4 - 7 = -3
 
Substitute value of y into first equation
 
x = 2(-3) + 7
 
x = -6 + 7 = 1
 
:)