Question

Given the following equations:

Equation 1
5x+2y=7
Equation 2
x+y=5
Find the value of 4x + y

Answer 1

• 2

Explanation:

Given

Equations

• 5x+2y=7
• x+y=5

To find

• The value of 4x + y

Solution

Subtract the second equation from the first one side-by-side:

• 5x + 2y - (x+ y) = 7 - 5
• 5x - x + 2y - y = 2
• 4x + y = 2

The answer is 2