exam Maths Puzzle Numerical Ability

How do you figure this out when y is isolated on both equations:
y=3x+1
y=6x-1

Thank you

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exam Other Question

This is a last Subsitution question, but this one says solve by either ;addition or subtraction.

The problem is:
12a-5b=18
15a-5b=30

Please and Thank You=) "Your grades are 76, 90, 85 and 87. If the next grade received counts twice, what grade do you need to maintain an average of 84 in the class?"