The two equations given are: 3y + 2z = 12 y - z = 9 Now let us take the second equation first and find the value of y in relation to z y = 9 + z Now we will put the value of y found from the second equation in the first equation. 3y + 2z = 12 3(9 + z) + 2z = 12 27 + 3z + 2z = 12 5z = 12 - 27 5z = -15 z = -(15/5) = -3 Now again we will put the value of z in the second equation for finding the value of y y = 9 + z = 9 - 3 = 6 So we find the value of "y" is 6 and that of "z" is -3
