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Katrina Rush
Mathematics
11 April, 20:02
18x - 16y = - 312
78x - 16y = 408
+5
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1
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Rebecca
11 April, 20:30
0
(-12,6)
Step-by-step explanation:
using elimination method multiply the second equation by - 1
18x - 16y = - 312
-78x + 16y = - 408
add the two equations
60x = - 720
divide by 60
x = - 12
plug - 12 into the first equation
18 (-12) - 16y = - 312
-216 - 16y = - 312
-16y = - 96
y = 6
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