exam Maths Puzzle Numerical Ability

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

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exam Other Question

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. write an expression for each quantity.

the number of gallons in 21 quarts

the number of gallons in q quarts