exam Maths Puzzle Numerical Ability

1/2d +3/8 = -2d

5/2t-t=3+3/2t

1/3(y-7)=2y+6

1/2(5x+8)=4x-5

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exam Other Question

Can the system
4x + 5y = -4
12x - 9y = -4

be solved more easily by using the substitution method or the addition method? And why? A 6 ounce can of orange juice sells for $0.87,and an 8 ounce can sells for $1.25.
which is the better buy?