Substitute the value 26.7 (or the exact value of 80/3) for x in the first of the original equation (x + y = 40) to find the value of y. Once you have found the value of y using the first of the original equation, you can substitute this value of y and the value of x (26.7) into the second of the original equation (0.75x + 1.5y = 40) to check your work. If the values that you find on the two sides of the equal sign are not equal, then you must recheck your work.

Complete Question

The complete question is shown on the first uploaded image

the value of  

Explanation:

From the question we are told that

       The equation is  (x + y = 40)

        The first value of x is  

        The second equation is  (0.75x + 1.5y = 40)

So  substituting

=>  

Now substituting y and   into second equation

 =>  

So  

terd muffin is the correct answer

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods