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What is the x-coordinate of the solution to the system of linear equations 3x plus y equals 13 and x plus 6y equals -7?
Wiki User
∙ 13y ago
3x+y=13
x+6y=-7
Multiply the second equation by -3 to cancel out the x's:
3x+y=13
-3x-18y=21
Find the sum of the y's and the numbers:
-17y=34
Divide by -17 on both sides:
y=-2
Plug the y back into one of the equations to find x:
3x -2=13
Add 2 to both sides:
3x=15
Divde each side by 3:
x=5
Plug both numbers back into the equations:
3∙5 -2=13
15-2=13
13=13
5+6∙-2=-7
5+-12=-7
-7=-7
Therefore x =5
Wiki User
∙ 13y ago
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A system of linear equations that has soluton is?
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What is 10 plus x equals 5?
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