Question

3x+7y=15,5x-129=23y
by cross multiplication​

Answer 1

Answer:

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Answer 2

Answer:

x=-39/13

y=12

Step-by-step explanation:

3x+7y=15--------1

5x-129=23y---------2

5×3x+7y=15

3×5x-23y=129

15x+35y=75

15x-69y=387

_ +. -

________________

104y=-312

y=-312/104

y=-39/13

substitute y=-39/13 in equation 1

3x+7y=15

3x+7(-39/13)=15

3x-21=15

3x=15+21

x=36/12

x=12