exam Maths Puzzle Numerical Ability

x=y+6
y=-2-x

My daughter is trying to solve this equation by substitution. I am useless in attempting to help her. We would greatly appreciate you explaining the answer.

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exam Other Question

Please help w/ the following:
Find the rational roots of F. List any irrational roots correct to two decimal places.
f(x)= x^4+7x^3+x^2-35x-30
Thank you. Please help.

Which of the ordered pairs (3, 1), (0,-4), (-4, 0), (-3 , -7)

are solutions for the equation x - y = 4.

Thanks
JMS