Y = 2x + 5 and 3x + y = 40

If you are solving for X, the answer is 7. If you are just solving for the equation then your answer would be 3x +2x +5 =40 or 5x+5=40.

Step-by-step explanation:

The solutions of the original equation are x=-5 and x=-2

Step-by-step explanation:

we have

Let

Rewrite the equation

Complete  the square

rewrite as perfect squares

square root both sides

the solutions are

u=-2,u=1

Alternative Method

The formula to solve a quadratic equation of the form

is equal to

in this problem we have

so

substitute in the formula

the solutions are

u=-2,u=1

Find the solutions of  the original equation

For u=-2

---->

For u=1

---->

therefore

The solutions of the original equation are

x=-5 and x=-2