Question

To solve the following system of equations which expressions could be substituted for y into the first equation?

Answer 1

Step 1:

Write the two systems of equations

3x + 6y = 12

2x - y = 5

Step 2:

To write an expression that can be used to substitute y from equation 1 into equation 2, you will make y the subject of the formula from equation 2.

Step 3:

`\begin{gathered} \text{From equation 2} \\ 2x\text{ - y = 5} \\ Make\text{ y the subject of the formula} \\ \text{y = 2x - 5} \end{gathered}`

Final answer

2x - 5