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Leon
Mathematics
13 March, 22:54
How to find
X-7y=-21
13x-7y=63
+2
Answers (
1
)
Alena Wood
13 March, 23:06
0
y = 4
x = 7
Step-by-step explanation:
First you would rearrange the first equation x-7y=-21 and make x the subject:
x = - 21 + 7y
Then substitute x into the 2nd equation to find y:
13x - 7y = 63
13 (-21+7y) - 7y = 63
-273 + 91y - 7y = 63
-273 + 84y=63
84y = 63 + 273
84y = 336
y = 4
Once you have y you can substitute this into any of the original equations to find x, for example:
x - 7y = - 21
x - 7 (4) = - 21
x - 28 = - 21
x = - 21 + 28
x = 7
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