1. Section 7.1
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y=-2x-1 & (I) y= 12x-16 & (II) At least one of the variables has a coefficient of 1, so let's use the substitution method to solve it. When solving a system of equations using substitution, we follow three steps.
(II):y= -2x-1
(II): LHS+16=RHS+16
(II): Write as a fraction
(II): LHS+4/2x=RHS+4/2x
(II): LHS * 2=RHS* 2
(II): .LHS /5.=.RHS /5.
(II): Rearrange equation
(I): x= 6
(I): (- a)b = - ab
(I): Subtract term
(I):y= - x^2
(I): LHS+x^2=RHS+x^2
(I): LHS-1=RHS-1
(I): .LHS /2.=.RHS /2.