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Yoselin Chang
Mathematics
10 July, 20:53
System of equations
X+3y=73
X+y=27
+5
Answers (
2
)
Giovanny Davies
10 July, 21:21
0
X+3y=73
x+y=27
Multiply the second equation by - 3.
x+3y=73
-3x-3y=-81
Now add.
-2x=-8
x=4
Plug in 4.
4+y=27
Subtract 4 from both sides.
y=23
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Giovani Grimes
10 July, 21:22
0
Steps:
1. Change x + y = 27 into y=mx + b form
2. Subtract x on both sides
Y = - x + 27
3. Substitute the y in x + 3y = 73 for - x + 27
X + 3 (-x + 27) = 73
X + - 3x + 81 = 73
-2x + 81 = 73
4. Now subtract 81 on both sides
-2x=-8
5. X = 4
6. Now solve for y
7. Now substitute the x in x + y = 27 for 4
8. 4 + y = 27
9. Subtract 4 on both sides
10. Y = 23
11. Your answer is: x = - 4 and y = 23 or (-4,23)
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