Use substitution to solve
7x-7y=-7
x+y=13

y=7

x=6

Step-by-step explanation:

7x-7y=-7

x+y=13

rearrange the y

x+y=13

subtract x on both sides

y=-x+13

substitute

7x- 7(-x+13)=-7

7x+7x+-91=-7

simplify

14x+-91=-7

get rid of the -91, add 91 to both sides

14x=84

divide 14 from both sides

x=6

Now that we have 6 we can simplify it into the other equation

x+y=13

6+y=13

subtract 6 from both sides

y=7

x=6

Substitute it into the equation to check if both variables are correct

x+y=13

7+6=13

7(6)-7(7)=-7

simplify

42-49=-7

-7=-7

x ≥ 18 is your answer

step-by-step explanation:

let "a number" = x

(2/3)x + 17 ≥ 29

isolate the variable (x). do the opposite of pemdas (parenthesis, exponent (& root), multiplication, division, addition, subtraction).

first, subtract 17 from both sides.

(2/3)x + 17 (-17) ≥ 29 (-17)

(2/3)x ≥ 29 - 17

(2/3)x ≥ 12

next, multiply 3/2 to both sides to isolate the x

(3/2)(2/3)x ≥ 12(3/2)

x ≥ 12(3/2)

simplify. multiply, then divide

x ≥ (12 * 3)/2

x ≥ (36)/2

x ≥ 18

x ≥ 18 is your answer

~

triangle and cube

step-by-step explanation: