Question

find the value v of x+y-2 subsituition method 3x+4y=-7 2x+7y=1 ​

Answer 1

Answer

By substitution method,

3x+4y=10 & 2x−2y=2⇒2(x−y)=2⇒x−y=1 ___ (2)

∴x=y+1→(1).

Substituting in equation (2).

∴3x+4y=10⇒3(y+1)+4y=10

⇒3y+3+4y=10⇒7y=7⇒y=1

∴x=1+1=2

∴x=2,y=1

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