1233042260
25.06.2019 •
Mathematics
Which statement about the pair of equations is true? x = -2y + 300 3y = 800 - 4x a) the equation pair has no solutions. eliminate b) the equation pair has many solutions. c) the equation pair has exactly 1 solution. d) the equation pair has exactly 2 solutions.
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Ответ:
C)The equation pair has exactly 1 solution.
Step-by-step explanation:
Rewrite the pair of equations
x + 2y = 300
4x + 3y = 800
Multiply the first equation by 4.
4x + 8y = 1200
4x + 3y = 800
Subtract the second equation from the first: 5y = 400 → y = 80 
Putting this value back in the original equation, x = -160 + 300 = 140
The equation pair has exactly 1 solution, x = 140, y = 80
Ответ:
the answer is 5%. If u are on k-12 i know for a fact; if ur not then it might be wrong.
:)