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What is the solution of the system?{4x−y=−38x+y=3Enter your answer in the boxes.

What Is The Solution Of The System4xy38xy3Enter Your Answer In The Boxes class=

Sagot :

Solution:

Given:

[tex]\begin{gathered} 4x-y=-38 \\ x+y=3 \end{gathered}[/tex]

Solving the system simultaneously by substitution method;

[tex]\begin{gathered} 4x-y=-38\ldots\ldots\ldots\ldots\ldots(1) \\ x+y=3\ldots\ldots\ldots\ldots\ldots\ldots.(2) \\ \\ \text{making y the subject of the formula from equation (2);} \\ x+y=3 \\ y=3-x\ldots\ldots\ldots\text{.}\mathrm{}(3) \\ \\ \text{Substituting equation (3) into equation (1);} \\ 4x-y=-38 \\ 4x-(3-x)=-38 \\ 4x-3+x=-38 \\ 4x+x=-38+3 \\ 5x=-35 \\ \text{Dividing both sides by 5;} \\ x=-\frac{35}{5} \\ x=-7 \\ \\ \text{Substituting the value of x into equation (3) to get y;} \\ y=3-x \\ y=3-(-7) \\ y=3+7 \\ y=10 \end{gathered}[/tex]

Therefore, the solution of the system is;

[tex](x,y)=(-7,10)[/tex]

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