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linear equations 10-0.5y+-1.5x and y=0.5(6x+40)

I need help with the linear equation: 10 - 0.5y = 1.5x and y = 0.5(6x + 40)

On a trivia game show, a contestent will answer 21 questions. A maximum of 200 points cana be earned. Some questions are worth 10 points and some are worth 8 points. Howmany of each point-value question must the contestent answer to earn the manimum numbe...