Use addition or substitution to find the value of x for this set of equations.top line 12x - 5y = 30 bottom line y = 2x - 6

This question is particularly straightforward simply insert the second equation into the first for the variable y.

y=2x-6 into 12x-5y=30

12x-5(2x-6)=30 ; distribute the 5 into the substituted portion

12x-10x+30=30 ; be careful to distribute the negative sign also

2x+30=30

2x=0

x=0

## Comments

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