Whoever told you that you were wrong, copy this and show them
if x=1.24, y=-3.44
LS = 5(1.24) + 5(-3.44)
= 6.2 - 17.2
LS = 7(1.24) - 3(-3.44)
= 8.68 + 10.32
Trust yourself !!
Multiply both sides of the the last equation by 5/3, to give
11.667 x - 5y = 31.667
Add that to the first equation and you get
16.667x = 20.667
x = 1.24
y = (7x-19)/3 = -3.44
If that was your answer, rounded off to three significant figures, then you are correct.
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