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If (y=x+2) and (3x+y=18), what are the values of (x) and (y)?

Answer and explanation

Correct answer: (x=4,\ y=6)

The substitution method uses one equation that already expresses one variable in terms of the other. Replacing that variable in the second equation changes the pair into one equation with only one unknown. Solve it first, then use the result in the simple expression to find the other variable. Finally, checking both original equations is a useful way to confirm that the ordered pair is correct.

The first equation gives 
m y=x+2
m. Substitute this in 
m 3x+y=18
m: 
m 3x+(x+2)=18
m. Combining like terms gives 
m 4x+2=18
m, so 
m 4x=16
m and 
m x=4
m. Then 
m y=x+2=4+2=6
m. Therefore option D, 
m (x,y)=(4,6)
m, is correct. It satisfies both equations.

Related tags

Linear EquationsSubstitutionSolution PairEasyClass 10

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