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snikergrace
17.07.2019 •
Mathematics
Solve the system of linear operations
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Ответ:
Step-by-step explanation:
I'll be solving this system of equations using the elimination method since the x and y values are neatly lined up.
I want to get a pair of x's or y's that cancel out, and it looks like the easiest way to start would be by multiplying the first equation by -2 (the y's will cancel).
I chose to multiply the first equation by -2 instead of multiplying the second equation by 5 because -2 is a smaller number and easier to multiply by.
Distribute -2 inside the parentheses. Now you've got:
Add up the equations from top to bottom.
-10x plus x is -9x, the -4y and 4y cancel out, and 16 plus 2 is 18. Make this one single equation.
Divide both sides by -9.
Substitute this value of x into the second equation (less to do with the x since it has no coefficient which means no multiplying).
Add 2 to both sides.
Divide both sides by 4.
The final answer is
.
Ответ: