exam Maths Puzzle Numerical Ability

Solve the system by the substitution method.
x - y = -3
x - y = 4
Thank you.

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exam Other Question

Help needed please
Find X, Y, and Z
X + Y + Z =1150
X = 4Z + 100
X = 6Y + 50

thank you I think I am right but i want to make sure. Find the value of the polynomial
9x^2 � 5x � 5 when x = 4 I got 119 am I right?