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WAEC Mathematics 2020 Paper

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Question : 9

Total: 48

Solve 3x - 2y = 10 and x + 3y = 7 simultaneously

x = -4 and y = 1
x = -1 and y = -4
x = 1 and y = 4
x = 4 and y = 1

Solution:

3x - 2y = 10 - - x 3

x + 3y = 7 ---x 2

------------------------

9x - 6y = 30

2x + 6y = 14

-------------------------

$\; \frac{11x}{11} \; \frac{44}{11}$

x = 4

From x + 3y = 7

3y = 7 - 4

$\; \frac{3y}{3}$ = $\; \frac{3}{3}$

y = 1

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