0.1x+0.2y=-1;0.5x-0.9y=6.4
1 answer:
.1x+.2y=-1 .5x-.9y=6.4 ×-5 equation .1x+.2y=-1 -.5x-y=5 .5x-.9y=6.4 solve by elimination -1.9y=11.4 ÷-1.9 both sides y=-6 solve for X .1x+.2 (-6)=-1 .1x-1.2=-1 +1.2 both sides .1x=.2 ÷ 1 both sides x=2 plug into 2nd equation to see if it's true x=2 y=-6 0.5(2)-0.9(-6)=6.4 1+5.4=6.4 6.4=6.4 answers hold true
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