A. Thay intersect at one point.
1.9 times 13 =24.7
The total mass of 13 jars of sugar is 24.7 kg
7(5x+3y=27)
-5(7x+9y=51)
———————
35x+21y=189
-35x-45y=-255
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-24y=-66
Y=-66/-24
Y=2.75
——————-
Now replace Y with one of the equations to find x
—————
5x+3(2.75)=27
5x+8.25=27
5x=27-8.25
X=18.75/5
X=3.75
——————
Final answer =
X=3.75
Y=2.75
Y + 0.4 = 2 .....subtract 0.4 from both sides
y = 2 - 0.4
y = 1.6 <==