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OpenStudy (anonymous):
-3 x + 4 y = 25 and y = 2 x + 10 substitute
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OpenStudy (anonymous):
multiply equation 2 with 4 and then solve for x
OpenStudy (anonymous):
Substitute the value of y in the equation -3x +4y = 25 and solve.
OpenStudy (anonymous):
In otherwords substitute 2x +10 for y in the first equation
OpenStudy (anonymous):
-3 x + 4(2x+10) = 25 You should be able to distribute and use order of operations.
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