10a+35b=0; 21a-35b=217 ...associative property of addition
31a = 217 .............addition property of equality
a = 7 .....................division property of equality
2(7) +7b = 0 --------------substitution property of equality
14+7b = 0 -----------------mulplication property of equality
7b = -14 --------------subtraction property of equality
b = -2 ----------------simplify
Answer:
all I know that an octagon has 8 sides and a triangle has 3 sides and a square has 3 sides and a hexagon has six sides and a Pentagon has 5 sides
Answer:
Its a right triangle
Step-by-step explanation:
(-7) squared is 49.
(-7) squared = -7 x -7 = 49
Basically, anything is squared with a number, just double it the number.