exam Maths Puzzle Numerical Ability

Solve by the elimination method.
3x + 4y = 3
6x + 8y = 6

Can someone please help me with this. I was doing really well with my work but now am stuck again. Help me please.

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exam Other Question

please help me to solve

Pencils cost 25 cents apiece. Pens cost 80 cents apiece. Susan spent $20 for a total of 36 pens and pencils. How many pencils did she buy?

thank you! solve the system using the substitution method. present as an ordered method. If not, specify whether the answer is no solution or infinite many solution
4x + y=4
2x + 8y=0