Martin had 7 pounds of grape left, and he gave away 2/5 of them. explain how to use compatible numbers to estimate the amount of grapes he gave away

2/5  is close to  1/2  , and it is easy to find  1/2  of 7 mentally. Half of 7 is 3.5, so Martin gave away about 3.5 pounds.

Step-by-step explanation:

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a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation: