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Answers by Thomas E.

Let e = cost of the espresso and b = cost  of the biscotti   Set up a series of 2 equations in 2 variables based on the information given:   2e +  b = 4.40   e +2b = 3.55   And solve using either substitution or elimination

Let x = # dimes, then 24-x = # of quarters   10(x) + 25(24-x) = 435  and solve for x   10x + 600 - 25x = 435   -15x = -165   x = 11 = dimes, 13 quarters

y=2x+3; y=4x-1 (answer)

Since y = y, 2x+3 = 4x - 1   2x = 4   x = 2, substitute it in and y =7