2 answers:
Answer:
x=9
Step-by-step explanation:
We can use similar triangles and ratios. Put the small triangle side over the large triangle side.
9cm 3x -20
---------- = ---------------- We need to add the sides to get to the larger triangle
72+9 cm 3x-20 + 56
We can cross multiply to solve
9 * (3x-20+56) = (72+9) * (3x-20)
Simplify
9*(3x+36) = 81*(3x-20)
Distribute
27x +324 = 243x -1620
Subtract 27x from each side
27x-27x +324 = 243x-27x -1620
324 = 216x-1620
Add 1620 to each side
324+1620 = 216x
1944 = 216x
Divide each side by 216
1944/216 = 216x/216
9=x
Answer:
im not great at math but i think x=9
Step-by-step explanation:
9/72=0.125
72*0.125=9
so 56*0.125=7
therefore 3x-20=7
solve for x
3x - 20 = 7
3x = 7 + 20
3x = 27 (divide both sides by 3 to get x)
3x/3 = 27/3
x = 9
......
.......
or you can try
56/72=0.77777777777
72*0.77777777777=56
so 9*0.77777777777=7
therfore 3x-20=7
solve for x
3x - 20 = 7
3x = 7 + 20
3x = 27 (divide both sides by 3 to get x)
3x/3 = 27/3
x = 9
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Answer:
A
Step-by-step explanation:
-x + 2y = 8
5x + 2y = -4
+ x. -2y. -8
6x = -12
÷6. ÷6
x = -2
5(-2) + 2y = -4
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+10. +10
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÷2. ÷2
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The answer is 6
hope this helped
