Step-by-step explanation:
x - y + 5z = 29
y + 2z = 4
z = 7
since z = 7 we can use this value in second equation
y + 2×7 = 4 and y = -10
now we know the value of y we can solve the first equation
x -(-10) + 5×7 = 29
x + 10 + 35 = 29
x = -11
Answer:
yes
Step-by-step explanation:
4+7 is greater than 9
Answer: 
Step-by-step explanation:
Given
Length of the plank is 
Foot of the flank is
away from the wall
Lizard climbs 2 m up the wall
from the figure, the two triangles are similar

So, the distance from the wall is

Answer:
-4
Step-by-step explanation:
y = x +b
6= 10 + b
b = 6 - 10
b = -4
Answer:
y = 9
Step-by-step explanation:
the two sides are balancing so that means one 'x' and three 'y' equals four 'x' plus one 'y'
x + 3y = 4x + y
subtract 'x' from each side to get:
3y = 3x + y
subtract 'y' from each side to get:
2y = 3x
if 'x' = 6 then:
2y = 3(6)
2y = 18
y = 9