exam Maths Puzzle Numerical Ability

3x-5y=7
-9x+15y=-21

solve for x and y

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exam Other Question

write an inequality for the situation
Allen can spend at most $10.00 on party supplies. Plates cost $3.00 per packages and napkins cost $2.00 per package. Solving by elimination..
3x+2y=9
-x+3y=8