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Simultaneous Equations
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Question 21
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Markscheme
Solve the simultaneous equations
2b+20=7a5a+3b−1=0 \begin{aligned} 2b + 20 &= 7a \\ 5a + 3b - 1 &= 0 \end{aligned}
2
b
+
20
5
a
+
3
b
−
1
=
7
a
=
0
[3]
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