Slovel each pair of equation by subtitution

Question

x-y=7
x+y=9

Answer 1

Substitution method :

The equations of linear system are .

Solve the equation 1: for y, since the y has a coefficient of .

Subtract x from each side.

Multiply each side by .

.

Substitute the value of in the equation 2:  and solve for x.

Add 7 to each side.

Divide each side by  2.

.

Substitute the value of in the equation to find the value of y.

.

The solution .