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