Assuming 5z - y = 0, then
5z = y
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Z2 - 5Z + 4 = 0 (Z- 1)(Z - 4) so, Z = 1 ---------- and Z = 4 -----------
r = 5z 15z = 3y (divide by 3 to both sides) 5z = y r = y
15z² - 22z - 5 = 0 → (5z + 1)(3z - 5) = 0
-96 = 33-y -96-33 = -y -129 = -y y = 129 Remember a minus divided into a minus is equal to a plus.
x=372/71 y=-21/9