exam Maths Puzzle Numerical Ability

i need to Graph using the intercept method: 2x - 5y = 10. please show me how to graph this!

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exam Other Question

We were given a practice question and then the answer. I do not understand how they came up with the "3's" in the eqaution below. If you could explain this, I would greatly appre THE COST OF A FIELD TRIP IS $280 PLUS $5 PER STUDENT. THE SCHOOL CAN SPEND AT MOST $500 ON THE FIELD TRIP. HOW MANY STUDENTS ARE ABLE TO GO ON THE FIELD TRIP?