7.85
explanation
you multiply the two numbers together
-4x+0y=-8
=> x=2
substitute 2 into either function for y
it will come out the same and u will have solution
Note, if slopes or coefficient of x are the same => no solution because lines are parallel
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The answer is 24 cm squared because to find the area of a rectangle you multiply the width by the height. 6 x 4= 24