Question

3 (2x-y)+2 (x+4y)-5 (2x-3y) при x=3y y=-1

Answer 1

Решение на фото
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Ответ: - 11

Answer 2

To evaluate the expression 3(2x-y) + 2(x+4y) - 5(2x-3y) when x=3y and y=-1, we need to substitute these values into the expression and perform the calculations.

Step 1: Substitute the values of x and y into the expression: x = 3y x = 3(-1) x = -3

y = -1

Step 2: Replace x and y in the expression: 3(2x-y) + 2(x+4y) - 5(2x-3y) = 3(2(-3)-(-1)) + 2((-3)+4(-1)) - 5(2(-3)-3(-1)) = 3(-6+1) + 2(-3-4) - 5(-6+3) = 3(-5) + 2(-7) - 5(-3) = -15 - 14 + 15 = -29 + 15 = -14

Therefore, the expression 3(2x-y) + 2(x+4y) - 5(2x-3y) evaluates to -14 when x=3y and y=-1.