exam Maths Puzzle Numerical Ability

Solve the following systems by substitution
4x - 12y = 5
-x + 3y = -1

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exam Other Question

28. Slope 1/2; y intercept (o, -6)

Can you please help me with this one?

Thanks
Carolyn Solve for y in the following equations:

1. 25x-5y=15
y=_______

2. 18x+6y=(-12)y
y=_______