exam Maths Puzzle Numerical Ability

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

thank you

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exam Other Question

Graph using the intercept method: 2x + y = 4.

I am a bit confused on this one, any help would be greatly appreciated. Thanks Solve the system by the substitution method.
x - y = -3
x - y = 4
Thank you.