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Mathematics
Hurst
12 February, 20:33
Solve using substitution.
-7x + 9y = 20
y = 10
+1
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1
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Draven Lin
12 February, 21:21
0
x=10
Step-by-step explanation:
1. substitute y for 10 getting - 7x + 9 (10) = 20
2. 9 (10) = 90
3. with - 7x+90=20 subtract 90 on both sides getting - 7x = - 70
4. then divide by - 7 on both sides getting x=10
5. to check u substitute x with 10 and y with 10 getting - 7 (10) + 9 (10) = 20. then multiply and add/subtract to get 20=20
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