2 years ago

a student writes "the difference between 15 and the product of 5 and y" to describe the expression 5y-15.Explain the error.

1 answer:

7 0

The word 'difference' indicates the use of subtraction in a Mathematical sum

The error is that the sum could be 15 - 5y instead of 5y - 15

A subtraction sum does not have the commutative properties, meaning that we cannot do the sum in any order.

A sum 15 - 5y will give a different result with the sum 5y - 15 for the same value of y.

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3 years ago

What is the solution to the system of equations? 2x – y = 7 y = 2x 3

velikii [3]

Answer:

I will assume the second equation is y=2x^3. If it is y=2x+3 or y=2x-3, the lines will never intersect: they have the same slope (2):

Step-by-step explanation:

2x – y = 7 can be rewritten as: y = 2x -7. It has a slope of 2. The second equation, y = 2x 3, isn't clearly written. If the 3 has a plus or minus sign, then the lines will never intersect: they have the same slope, 2.

I'll assume the second equation is y=2x^3.

See attached graph.