andrejr0330jr
27.06.2019 •
Mathematics
Solve by elimination. 7x+3y=25 -2x-y=-8
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Ответ:
x=1 , y=6
Step-by-step explanation:
7x+3y = 25
-2x-y = -8
Multiply the second equation by 3 so we can eliminate y
3(-2x-y )= -8*3
-6x -3y = -24
Add this equation to the first equation
-6x -3y = -24
7x+3y = 25
x = 1
But we still need to find y by substituting x =1
-2x -y = -8
-2(1) -y = -8
-2-y = -8
Add 2 to each side
-2+2 = -8+2
-y = -6
Multiply by -1
y = 6
Ответ:
n1 || n2 | given
<1 supplements <2 | same side exterior angles supplement eachother