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Keyla Fox
Mathematics
7 March, 08:27
How do you substitute 7x+2y=-19 and - x+2y=21
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Ximena Yoder
7 March, 08:29
0
Steps:
1. Take - x + 2y = 21
2. Add x on both sides
2y = x + 21
3. Divide everything by 2
Y = 1/2x + 10.5
4. Substitute the y in 7x + 2y = - 19 for 1/2x + 10.5
7x + 2 (1/2x + 10.5) = - 19
5. Multiply everything in parentheses
7x + x + 21 = - 19
8x + 21 = - 19
6. Subtract 21 on both sides
7. 8x=-40
8. Divide each side be 8
9. Your answer is
X=-5
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Gaige Robbins
7 March, 08:54
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It's easier to use - x + 2y = 21
so make it all = to x
should come out to x = 2y - 21
now substitute what you just found = to x into the other equation
7 (2y - 21) + 2y = - 19
now distribute and simplify
14y - 147 + 2y = - 19
16 y = 128
y = 8
now substitute 8 for y in either equation
-x + 2 (8) = 21
-x = 5
x = - 5
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