Question

Evaluate the expression 2x+ y when x = 3. y=1.​

Answer 1

2x+y+x=3+y=1

2x+x+y+y+3=1

2x+2y+3=1

2x+2y+3-3=1-3

2x+2y=-2

Answer 2

`\boxed {\tt 7}`

Explanation:

We are given the expression

`2x+y`

and asked to evaluate when x=3 and y=1. Therefore, we must substitute 3 in for x and 1 in for y.

`2(3)+1`

Solve according to PEMDAS: Parentheses, Exponents, Multiplication, Division, Addition, and Subtraction.

Multiply 2 and 3.

`6+1`

Add 1 and 6.

`7`

The expression 2x+y evaluated at x=3 and y=1 is equal to 7.