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30.06.2019 •
Mathematics
Solve for the system using substituion. 7x−8y=112y=−2x+9
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Ответ:
You substitute the y-value of the second equation into the first:
→7x−8⋅(−2x+9)=112
→7x+16x−72=112
→23x=184→x=18423=8
Now put back the value of x in the second equation:
y=−2⋅8+9=−7
So x=8andy=−7
Check your answer with the first equation:
7⋅8−8⋅(−7)=56−(−56)=112 check
Step-by-step explanation:
Ответ: